I would say that if it were possible for someone to replace an old original part with an identical modern replacement, then that would be okay, but there is no way to perfectly restore a drum that has had extra holes drilled into it any more than it would be possible for a doctor to perfecrtly restore a person who had a gunshot wound. You can patch things up, but the fact that the structure has become comprimised is always going to leave a scar -no matter how small it may be.
I can only tell you how I look at collecting vintage drums:
#1. If the drum has "extra holes", then I don't bother with it...period.
#2. If the drum has been recovered or re-painted, then I don't bother with it.
On the other hand...if I am looking for a vintage sound for a kit to play on gigs, then I really don't care if the drums have been recovered with non-original finish or if the cymbal tilter is the correct one...whatnot, etc. In fact, I might even prefer a non-original drum because it is less to worry about as far as transporting and things getting bumped et.al.
But COLLECTING is, in my opinion, trying to get pieces that are as "like new" as possible. And insofar as drums that have been "restored"...as I stated earlier...in some cases, it is impossible to ever properly restore some drums (ex. Ludwig 3-ply wrapped shells). No matter how good the plastic surgery is, the knowledge of that imperfection is enough to make a big difference between it and a drum that really is "perfect" (original).
Case in point. I don't know if anyone here will remember the Gretsch Birdland that was on Ebay several years ago... a kit that had been "uncovered" in a little old ladies attic. It was virtually in mint condition. The hardware was GOLD-plated (real gold!) and the finish was a beautiful green paint. It was complete with original Turkish K Zildjians (with original paper labels intact!!!) and original leather cases in near-perfect condition. There were even the original sticks and brushes and lesson books! It went for over $15K and many thought it would go for much more than that!! This was an exceedingly rare kit and it was akin to discovering King Tut's tomb for Gretsch collectors! But these are the things that collectors live for. Whoever won that kit paid a LOT of money for it, but also now owns one of the most complete and original desirable vintage kits in the modern world! worth it? You tell me. They must have thought so!
Personally, I own a particular snare drum that was considered nothing special when it was new. It is a Ludwig 6-lug gold sparkle snare in its original gray suitcase and Gladstone rubber suction practice pad. The drum was found in an old country school when the school closed down and the contents were auctioned off. It had the original Weathermaster heads. It was like finding a drum in a time-capsule. to play this drum is to hear how a real Ludwig drum sounded during that period of time. There is something in the vibe of that kind of originality that counts for something.