I'm probably not actually even going to make mine cnc to start with, until I decide to go 4 axis there is not a lot of point as any wings I would need are tapered and then I would probably just build a small machine for them. most of what I do is just cutting square blocks and I can do that without so will just have some sort of motor and gearbox and some basic controls. I also decided to make the machine the full 6meters ( full length of alli) so that means ether belt or rack.no I do have some spare rack here that was left over that I could use but its going to be hard to get it to work without having it on booth sides so I'm going to probably have to use a belt to drive that.