Ive been thinking about different bodies and wheels that might fit the Rally. After some checking ive discovered that the Proline Focus ST body for the Slash has nearly perfect dimensions. Im going to order one to see how it fits.
Also, the Protoform PF8 GT body appears to have excellent dimensions as well. Which means pretty much any body meant for that car should fit as well (there is a Mclaren body that comes stock on the Ofna Ultra GTP2E)
It looks like 1/8 GT car tires/wheels will fit and are only about .2 inches smaller than the factory rally tires. If you used some .17mm adapters (possibly some + offset would be necessary) they should work great for harder onroad driving.
Just thought this was interesting.