Bill,
I'm of the opinion that a restocked gun with either new metal finishes or old will be a crap-shoot as to whether or not it will be able to bring the ROI to be worth the investment (money/time). The exceptions to that can be found in some cases, but not one that I can think of if you are paying the likes of Turnbull, SDH or others of equal. Now if you are doing the work and you don't plan to sell them, that's a different story.

I'm going to have about $3700 in a completely resto'd Parker 12g #1 framed, GH damascus. It will be as nice or nicer than when new. Will it be worth it? To me, yes. Could I sell it for that to one of our members? I doubt it. But then I doubt anyone could find one as nice with original everything, let alone could I afford it, nor could I shoot it well with the 3" drop.