I'd never replace the stock,,even with a new one done by G&H (no disrespect to them).
That's the heart and soul of the rifle and it's custom built history.
Restoring the original far better than having to explain that it looked 'just about like this one..' when it's gone.

I don't really see anything in the few photos that'd make me think twice about restoring the rifle completely.
I've seen a lot worse.
Take lots of pics during the restoration to document it's original and restored configuration.

Very nice find.