Personally, I'm a big fan of old school Mauser sporting rifles. I wouldn't be without at least one, but I don't try to justify it as being practical or cost efficient. If you're going to build one, the VZ-24 (Czech) is a good option. I've heard (and it sounds reasonable to me) that the Germans had quality control issues during both wars that made some of their actions less desirable. I don't know that from first hand experience. I do know that that the VZ-24 actions I've seen/used have all been acceptable. You can find lots of them on Gunbroker. Years ago actions that already had the bolt handle done by Kimber of Oregon were all over Gunbroker. You'd most likely still want to replace the safety, put a new trigger on it, and get rid of the locking screws & holes on the bottom. Unless you really just want to show off your Mauser sporter, Paul and Doug are right to advise finding a commercial action.