The only snag I see is the extractor. I know Remington has/is making a few models in 6.8 SPC, so they must make extractors. But are those available for sale? If not you're looking at making a Sako extractor setup for it. And even if you can get them, the machining on the bolt nose for the recesses is not exactly easy, though it is doable if you're careful and have the correct carbide cutter. Now if you start with a Howa with its M16 style extractor, then your life would be way easier and it would be a snap to convert.