In several of his posts on different forums he has fine shooters. Nothing is going to make them worth more. The work he is doing will probably make them worth less. He is looking to spend a lot more money than they are worth in current condition to make them resemble and maybe even pass off as originals while in actuality reducing their value to someone who actually knows what they are looking at. To someone who does not know they will be overpaying on a cobbled together fantasy piece.
So he is either spending a lot of time and money for a rifle that will only look like an original. Or he is spending a lot of time and money to fool someone and to part them from their money.
There are a lot of red flags. He is trolling around the internet asking specific questions that appear to be attempts to recreate original firearms.
When questioned on the Mauser he states that with it just tapped and glued on the "the screws ripped out". "The K98 8mm round has big time recoil and that is why the Germans soldered on the mounts, so they would not rip out."
Initially he said he was abandoning the initial rifle due to the stripped out screws. Then when it was suggested he drill and tap to a bigger diameter or coil them he changed to say he has other reasons for scrapping it. Then it sounds like he did try to salvage it but it did not work.
When told that others had mounted scopes on Mausers without solder and shooting more powerful rounds he tried to defend his position with a lot of "yeah buts".
According to the tables I can find the 8x57 Mauser (170 grain at 2400 FPS) has less recoil than the .308 Win. (150 grain at 2800 FPS) and less than many other rounds typically used today that I would not consider hard hitters. r
http://www.twoamendments.com/post/rifle-recoil-table-sortableThere are a lot of other red flags in his posts. His defensiveness, coming in on a first post with his request, story changing...
He may be clueless and does not see the problems. He did get some answers initially. He does not handle questioning about what he wants to do. Might have a legitimate end game. Maybe even just letting it sit in his safe.