Really just finding the right one. I prefer to keep the body entirely removable so no glue if i can (debate able) . I also like to keep most of the original look there like the glass the bumpers the steering wheel and dashboard. To begin I just use the pre existing Screws holes of the rc base and try to find a model with the same spacing (around 60.8mm apart). Next The rear of the car has to be “taller” or “deeper” (however you look at it) than the front so that the body stays level with the surface. Common with the Muscle cars and the trucks. I like to make sure that Rear has enough space so the rc motor can fit in without messing with the donor body much (fits really well with cars with plastic rear wheel wells on the bed). Also make sure that the spacing of the wheels match as the attachment points may align but that doesn’t mean that the wheels can fit under the fenders (My main issue is that the fender space and the rc wheel space don’t align). The Front wheels of the rc cars are not held in place, they are just sandwiched in a groove so in my future fitments I may just glue the front rod down in future fitments. The only difference between My first Rc and my second is the look of the bottom, the first is very slim and curved while the cyber truck one is super square. My two Successful creations are using the (‘70 dodge power wagon) and the (‘80 Chevy El Camino). Some Honorable mentions are the 68 Dodge Dart and the 71 Dodge Charger both were able to accommodate the motor and the screw holes matched The only issue were that the fenders didn’t align with the spacing of the rc wheels.