Good luck on the folding stock. That has become the proverbial Holy Grail of the FAL world. DSA had them a couple of years ago but the supply dried up REAL quick. I went to Knob Creek that year on Saturday and first thing went to DSA to get one and they had already sold out.
IIRC the trunion and the dedicated bolt carrier are the hard parts to come by though I've seen the carrier at the Creek.