The problems with belts is they are flexible, and act a little like a spring. You'll notice this more in the middle of the travel. And as you move towards the ends, it'll be easier to flex toward the middle, where the belt is longer. The tighter you can pull the belt, the better.The use of belts would simplify things a bit I'm thinking. Pros and cons??
One member here did a lot of belt research a few years back, and determined that you need to use a 4" wide belt to get stiffness approaching screw drive.