Go here and talk to these folks, they'll get you lined up.
Don't concern your self with parts guns, I just finished one making a M1903a4 to shoot CMP GSM Vintage Sniper matches. All USGI parts except for a new stock from the CMP. (Just posted pictured in the C&C section of the Firing Line.
I also have one (1903a3) that is 100% original. They are getting pricy but still can be found.
But I'm not concerned with "collector" values, I'm too old to take advantage of price increases.
Build one so you get to know them while you're searching for an un-modified species.