I think the metal work was done at the factory. That buttstock.. no, that I can't see.
We have seen that butt stock style(?) before. It was on a reworked rifle done by Savage Services. No old straight grip stocks available so they had cut the pistol grip off of an EG stock and used it. That is why I wanted to know what butt plate was on it.
I don't know the history of this rifle butt but that stock sure reminds me of that Savage Services stock modification.