Alright alright, let me come in with a reminder here.
I do not plan to have 128x128x128 chunks, but rather 128x128x2(or3), seeing as the character will only ever walk on one cubes width, left and right, and only ever interact with two cubes width, the walkable area and that right behind it.
I believe that cuts down quite a bit on the polycounts wether it is standalone enteties or large solid meshes generated with marching cubes.
All in all, I am not looking to create a minecraft clone as much as I want to create a terraria clone.
So, ive looked at this polyvox library, and the documentation is sorely lacking. I hope I can figure things out with some effort.
noiselib was lovely documented, dont know if I will need it now if polyvox does noise by itself.