Been following with interest, now time to contribute…
A few questions:
What scale and size is the car?
i.e. what is the wheelbase (distance between axles)
What width across the chassis?
Did you model the size on an existing car?
if 1/10th then maybe something for an HPI firestorm, plenty of aftermarket or original bodies for those or a body for a traxxas rustler? It’s a truggy so truggy or possibly truck bodies should fit. You might just need to “print” different shock towers or a set of body mounts to fit a truck body.
or possibly a Kamtec body. They make a wide selection, mainly 1/12th, but they have the dimensions on the site which might make it easier to match up the size and find the right body. see http://www.kamtec.co.uk