While that is intriguing and if they've found an old stash of USGI parts I'm all over it, HOWEVER, with the sportsmans guide I'm somewhat leery as I've gotten things from them before that have been WILDLY misrepresented...
Also I don't mean to rain on your parade, but builds for the beginner aren't necessarily cheap when it comes to getting a good 1911 up and running. Unless you're really looking for the thrill of the project its probably cheaper to get something off the shelf very close to what you want and tweek it a bit, or drop the $$$ and get a full custom that has everything on it you want.
I picked up something on the cheap a while back and spent about half the initial price just trying to get it working correctly... I've unfortunetly found that you get what you pay for in terms of 1911 parts and trying to cheap out has only left me with something that sat in the safe...
But, that said, let us know if you figure out who made the parts....