That looks really really cool, something about six-wheel-drive that just looks bad-ass!

One question though, how are all the wheels connecting together? Usually with 6WD belt/chain drives you have to have two pulleys/sprockets on one wheel so they can all connect together. Because if you connect your powered wheels to your middle wheels, the pulley on the middle wheel will be occupied, leaving no room to put a belt leading to the third wheel. Or are you just running one long belt around it all and putting in some tensioners to increase the engagement between the belt and pulley on the middle wheel?