Check this out from the above sticky:
Saiga Conversion stickyThe goal is to have 10 or less foreign parts. With a non-PG rifle like the Saiga, that means replacing four parts because it consists of 14.
The FCG obviously counts as three parts. If the folding stock is Made In The USA, then thats four parts. Since the PG did not exist at importation, it is an added part that brings the total up to 15; therefore, it either needs to be a US part or anther part must now be replaced.
Finally, the floorpates would get you down to 9 parts. Unless I missed something, you should be OK.