Sure you can do it. First you need to figure out what you want to build. Once you know what you want to build start researching it and go from there.
I built a scale RC of a snow cat(I have yet to finish the styrene work). I used the full size cat to figure out everything I needed to build. It was a fairly simple build due to not having complex suspension.
http://www.scale4x4rc.org/forums/sho...ght=bombardier
I am now looking at building a custom F1. I will use parts from other cars but the layout/design will be custom.