Wheels of all shapes and sized can be had from good model shops or online, Tamiya are great for their detail, as for the paint, I never had any issues using normal car paint, not to sound padantic, but you paint the inside and the lexan being clear gives it a nice glossy look, the key is just to take your time, use some very sharp sissors (sp) for the main parts an a sharp craft knife for the fiddly bits, then smooth it down with some wet and dry.