I hate too say it, but barfcom has a decent retro forum.
You will probably need to make a friend in your area to help build it.
For a true clone it will be costly. Nodak Spud has repro no fence lowers in grey.
Numrich will have surplus A1 stocks and hand guards.
Brownells normally has A1 uppers with no shell deflector, but they are black and match their A1 lowers.
Tear drop FA and three prong FH are easy to find. As are Colt 20rd mags and crappy nylon slings.
If historical correctness does not matter, buy a Windham A2 and put the Numrich stock and triangle hand guards on it. Relatively cheap and easy.