Solidworks is a great program for designing Jeep parts. I don't have it at home, but we have it at work. To answer your question Odhinn, yes a CAD program is great for designing parts. You can build it to exact scale in whatever degree of accuracy you want. Then you can drop in all the dimensions that you need to build it. Everythign I build has fill plans printed out before I begin. My son and I are just finishing up his pinewood derby for Cub Scouts, he helped do all the designing before we started. we printed out cutting templates and rendered 3-D images for reference.