22popnsplat: there are parts galore for the 1911 that will help you trick out a personally built 1911. As 44 man said, get yourself a basic pistol, or build a basic pistol and take it from there. I have done the same a couple of times and had a ball doing it.
Many shooters have built their own 1911s from parts and they work just fine. Many are more accurate and reliable than some of the factory guns. I would start with a basic piece first and then determine what you want to upgrade it with (trigger/hammer groups, grips, barrels, sights) after you wring it out. JMHO. Mikey.