There are 98 barrels and barreled actions all over the internet. If you want a new looking k98 that isnt a mongral, buy one, it can't be built. Most origional 98s in the condition you want will be great shooters and will cost less than having an expensive copy built. It seems kind of hipocritically ironic that you won't buy one from a company that has built thousands but you want to build one from miscelaneous parts and think you can end up with a superior rifle. I suppose it is a remote possibility but very doubtful. Cheaper, No!
"War is an ugly thing, but not the ugliest of things. The decayed and degraded state of moral and patriotic feeling, which thinks nothing is worth war, is worse. A man who has nothing which he cares more about than his own personal safety is a miserable creature, and has no chance of being free unless he is made free and kept so by the exertions of better men than himself" John Stuart Mill