Who can turn my wood for an Ithica Flues 20Ga."
Who can fit/ finish it?
Checkering?
Who to refinish the metal?

Is there a restoration place that works on them?

Brian Dudley in Spencerport, NY can do all that.
He may be loaded up with work at this point but is worth a call or an email.

http://bmdgunstocks.com/