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I don't think you'll gain anything other than complexity by going with 4 smaller tracks instead of 2 tracks running the length of the machine. Most of the turn-slip in a tank-style track occurs at the corners, which is just where you have your tracks.
We had a somewhat similar concept, with one caveat. Instead of empty space in the middle, we had two wheels. The wheels were slightly lower than the treads at the corners. It might be hard to visualize, but if you were looking at a side-profile of the machine, you'd see a short track at the front, a wheel at the center, slightly lower than the track, and a short track at the rear. We were pretty confident in this design as a power machine, but we've gone the way of speed so we ditched the treads and went with center-drive only.
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