Gene,
ANYTHING, can be restored. If you have the budget, the sky is the limit. Having said that, and this is critical, not everything SHOULD be restored.
Our own James Flynn detailed his restoration of a German double, much loved by the family that owned it, but, James believed, after the dust settled, that it really belonged in one of the canals around the area it was used in. Heritage is a thing that can lead to $15K thrown at an old car, gun, or, motorcycle that will net $1500 at auction.
Or, worse.
Tread carefully.
Best,
Ted