Hawkmoon is correct on this. It's a major undertaking unless you have the proper trade skills and machinery. And by ATF regs you have to complete it yourself without outside assistance. Here's an old pic of one. You have to cut your own frame rails and finish all the other holes and such.
Originally Posted by Hawkmoon
"The 1911 was the design, given by God to us through John M. Browning, that represents the epitome of what a killing tool needs to be. It was true in 1911 and it's true now." - Col. Robert Coates commanding, U.S. Marine Corp Special Operations Command Detachment 1 (DET 1)