Update:
I have to thank Jonathan/OldTimer for notifying me of the rules of the BRCA with regard to the rear wheels/tires. It seems in the UK you are limited to using rear tires on the rear.
However, the EFRA (and the Dutch RC Sporting Organisation which bases it's chassis regulations on that of the EFRA) doesn't seem to have rules restricting the use of the rear wheels to wide ones.
Of course it may be possible to enter the car as an RWD buggy with rear wheel steering and set up to drive around the track backwards real quick
However, I think it won't take long before they ban that sort of 'F1 style' of stretching regulations if you'd try that. Therefor, here's an alternative version to the car using DB01 uprights and C-hubs on the rear as well. It's my intention to build and test both types:
I prefer the narrow wheel version, both for expected performance (you don't need that wide wheels on the rear I think) and aesthetics. But if this change will help it to be legal on the UK events the changes are worth it!