as long as you get the jig and take your time their shouldn't be any issue finishing one up. The only thing you have to do is machine out the trigger control area. I've seen a video of a guy doing it with a drill press, I'm a machinist and would recommend a mill for the cleanest finish, but a drill press would be fine for functionality. The thing you have to keep in mind with these is that if you build it you can never sell it or give it away by law.