I saw that car at the Petit RC race too and I don't like the route for the belt. You shouldn't have any tensioner or pulley on the loaded part of the belt. I know X-Factory have done that in the X-5 but it doesn't make it right and it doesn't matter as much in Buggies.
As for the Pro3, it had long wishbones and shorts driveshafts, which meant the driveshafts were popping out while cornering. Besides it was as stiff as a chewing gum, unless you had a carbon fiber chassis for it.
Other than that this layout makes for a very safe car, very good in mod back in the days, but not so sure at the present moment as we seem to be looking for more and more steering.
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