It wouldn't cost anywhere near 2K, but no, I never really checked prices. I did it to a SA-GI and used spare USGI parts that I had on hand. Replaced trigger with a machined one piece checkered USGI, replaced the small hammer with a late war narrow spur, replaced the cast thumb safety with a USGI, replaced the cast slide stop with a checkered USGI, replaced the ILS mainspring housing with a late war 8 rib Remington-Rand, replaced the baby poop brown stocks that came on it with a set of late W.W.II Ithaca's, made by Keyes Fibre Co.That sounds very good! Hopefully it should not end costing as much as a real WWII USGI M1911A1. Did you ever check if it would be too expensive to do?
You use to be able to buy the USGI style thumb safety at Auto-Ordnance 1911 Pistols, and the USGI stocks can be bought at Simpson Ltd./Original 1911A1 stocks.