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technique

Mercedes Memories: Building Southern Cross Miniatures’ 300SLR
by Wayne E. Moyer

I never planned to be a model reviewer; it just happened, and it happened because of the Mercedes 300SLR! The sports and sports-racing cars of the 1950’s and ‘60’s had always been my favourite cars, and the 300SLR was at the top of that list. There were precious few kits or models of these cars in 1:25 scale back then, so I began collecting 1:43 scale models. By today’s standards the Solido and Politoys “models” of 1970 were crude, but they were better than nothing! Through a small collector’s club newsletter I read about a French company, Manou Auto Sport, who would make hand-carved wooden 1:43 scale models of any car you wanted for the ridiculously low price of $7.50. I ordered my two “most wanted” models, Gurney’s 1967 Eagle F.1 and Stirling’s Mille Miglia 300SLR from Manou in late 1972 and waited.
In January of 1973 I got a letter from Jacques Simonet telling me the Eagle was ready but his model-maker had built the Moss-Fangio Le Mans car, not the Mille Miglia car. He offered to have the correct 300SLR built if I would wait a few months more, but there was another option. He had this new white-metal kit of the Mille Miglia 300SLR and if I would take that instead, he’d let me have it at the same price. Well, I was a model builder, right? I didn’t know what white-metal was, but if others could build it, so could I. In due course a good-looking Eagle (I still have it) and a 10-piece kit (John Day, of course) of the 300SLR arrived. I’d been writing model airplane stories for Scale Modeler for a few years, so I photographed the kit as I built it and sent them a story on this “new kind of model”. It was published in the Fall, 1973 issue of “Scale Auto Modeler” (a short-lived American magazine) and I sent a copy to the address on the kit box. Much to my surprise, a few weeks later I received a package from John Day. In it were 4 new kits and a note that said, in effect, “That was nice— do it again.” I did, and well, I guess I still am.
So the 300SLR has always been one of my favourite cars. Incidentally, the name came from the P.R. department; the SLR bore as much resemblance to the 300SL as Jeff Gordon’s NASCAR ride does to a real Chevy Monte Carlo. The factory designation is W196S (Sportwagen) and it was, in effect, the Grand Prix car with the chassis widened in the middle to accommodate the required two seats and a bigger fuel tank. Its engine was bored out from the 2.5 litre Formula One limit to the “sports car’ limit of 3.0 litres, so it actually had more horsepower. I’ve collected a fair amount of reference material on the Mercedes and I’ve got a very soft spot for 300SLR models. I think I’ve built— or at least bought— every kit that’s been made in 1:43 scale, and when I saw the Southern Cross Miniatures kit (SCR005) listed in FSW I debated about ordering one; did I need another 300SLR? That question became moot when I unexpectedly received one from Southern Cross via GPM, along with a request to write a review after I’d built the model— shades of déjà vu all over again!
Upon opening the box I found pretty much a “standard” kit by current standards; 5 resin parts including the body and baseplate with integral interior, 5 white-metal castings, 4 very nice factory-assembled wire wheels with rubber tyres, 2 aluminum exhaust pipes, and 28 photo-etched parts, not all of which are used for this model. The perfectly etched “300SLR” badges are really tiny. Add the vac-formed headlight covers, flat windscreen, and jewelled light lenses and I count 55 parts; not a “superkit” but a far, far cry from that John Day model. An even greater difference was the three A4 sheets of instructions with colour photos of the model and the real car. The instructions
provide step-by-step information, a painting guide and a layout of the photo-etched parts tree. Although the decals are simple, numbers are provided for all three cars at Le Mans (along with three photo-etched license plates) and there are correct plaid “upholstery” decals for the seats.

Preparation was quick and easy with only a couple of small mould lines under the nose and tail and some “ragged edges” inside the cockpit. There’s a fairly large feed tag under the dashboard that must be cut away to get the baseplate to fit correctly. There was some thin flash inside the windows and small feed tags on the bottom of the air brake casting; be very careful not to break the integral hinges while removing them. The small white-metal parts have mould lines, of course, but those were small and easily removed too. All in all, parts cleanup took less than five minutes as opposed to a couple of hours on that John Day kit.
Southern Cross suggests a couple of ways to get the correct painted silver finish; I chose to use Metalizer and sealer, which worked very well, but when I applied the foil (included with the kit) to the side spears some of the clear sealer came off with the excess foil. If you choose that method, be sure to cut the foil to size before burnishing it down over the side spear. It’s almost a shame to paint those gorgeous wire wheels, but SCM is correct; chrome spokes were NOT used back then. The instructions say to paint the cockpit sides, non-upholstered parts of the seat, and the center console flat black. The 300SLR I photographed at the Ford Museum has medium blue leather or naugahide on those parts, and colour photos (“Supercar Classics”, Sept. 1989) of the Mille Miglia winner in the Mercedes Museum show the same thing, so I painted them blue, not black. Maybe my drill bit was dull, but the photo-etched instrument panel started to wrinkle when I tried to drill a large hole for the steering column, so I simply cut the lower part off. It’s hidden by the wheel, anyway. This is the first model I’ve seen with the air brake control panel; most of the photos I have are of cars without the air brake and the control box isn’t used on those.
There are quite a few differences between the Le Mans cars and those which ran in other races besides the air brake and the shorter headrest fairing that allowed it to work.

There are no small lights below the headlights; instead there are big driving lights inside the nose intake. The fuel filler tube was extended and there’s a small vent tube on the right rear fender that doesn’t appear elsewhere. The chrome “strakes” in the side vents aren’t there on the Le Mans cars, the windscreen is different, and the rear view mirror is housed in a substantial fairing, too. The Le Mans cars ran, at least part of the time, with an access panel removed from the right front fender and SCM’s model not only has that correct, but there’s frame and structure detail visible, too. I used the photo-etched “star” on the nose, but SCM provides a black one on the decal sheet and after studying the excellent race-day photo in Ludvigsen’s biography “Stirling Moss” I think the “painted” badge would be more correct. As I said, there are lots of differences, and as far as I can see, Southern Cross has them all correct!
Everything, from the major parts to the tiny photo-etched badges, fit just as they should and assembly was very straightforward with a couple of provisos. I had to cut the exhaust pipes a bit shorter (check photos to see how far they extend) and I cut the headlight covers a bit oversize— if they’re cut right on the engraved line they’ll be too small. I found that the rear tyres supplied in my kit were much too large (18.5 millimetre diameter) and rubbed against the wheel arches all the way around as well as giving the model a “nose down” stance. When I contacted Southern Cross at the email address on the instruction sheets they immediately mailed the correctly sized tyres to me. If you have an early kit with the same problem, they’ll take care of it.
Wheelbase comes out only 0.07 inches short (1:44 scale) and the body lines look right on the money to me. SCM’s model is easily the most detailed 300SLR in my collection and all its details (tyres aside) are correct. Even the “see through” wire wheels are correct; the SLR’s massive drum brakes were inboard. This well engineered and beautifully cast kit was a pleasure to build and will look (when I replace the rear tyres) “just right” from any and all angles. I’m glad SCM took the initiative as this model makes a fine addition to my collection.