Rear axle sideways movement is a no no and robber of good performance.
Easiest method is remove the hubs and add washers (go to B&Q and buy the smallest metal ones you can find) and then add them to both sides so wheel spacing is even. You want it so you can't see movement but you can feel a bit - if its too tight then the motor will have to work too hard to turn it. Glue the hubs back on and add a drop or two of oil to the washers and bearings.
Chuppa Chupp lolly pop sticks?
I've never heard of these!
When I were a lad, lollypop sticks were thin flat wood, as per the famed/infamous Popsicle chassis of BWamini Al Penrose. You surely couldn't be suggesting cutting out tiny washers from these? So I'm guessing Chuppa Chups have high tech hollow man-made 'sticks'? Come on Grah, let's be having some details, assembly instructions and photos please!
The Scaley GT40 isn't the only sidewinder configured car to exhibit this flaw. FLY's Lola T70, and Porsche 908/2 both have too much lateral play in their rear axles. No doubt there may well be other sidewinder cars which are guilty. But as can be seen the problem is easily rectified.
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