This is how we did it this year (We tried friction belts instead (BAD IDEA). We created a model of this too using timing belts but it was never fully implemented onto the bot. From what we played around with it, it worked wonderfully. Turning is the one spot you have to watch out for. When you use belts, you may get too much traction onto the carpet which could, in result, make turning a lot more difficult.
We used 80" belts if i remember correctly. We had 1 drive pully (center) and 4 idlers. Instead of using a series of wheels on the bottom, we decided to use slides.
The nice thing about using belts is it makes the connection to the gearboxes a lot simpler.
