IMO I woudl not run these seats in your car. They dont have to pass any crash testing and are not DOT or SAE approved. I have heared stories of them folding in crashes and such. So be careful.
As far as the engine stuff goes i can help you. The body work not so much. I do do most of my own, but im slow and miticulas about it. So i dont think i could be much help there :P