This is pretty nifty, but I would worry about the chain runs affecting the match-to-match reliability of 'drive straight' in autonomous.
Eventually the four wheels in the middle will make a trapezoid (or some other such non-square 4-sided shape) rather than a rectangle since the chains will stretch at different rates. This can be mitigated by directly running the chains from the gearbox to both sets of middle wheels. The typical WCD 6WD experiences this with nominal effects since the middle wheel locations are always constant.
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The gearboxes will need to be on opposite ends of the robot due to the axle length of the gearbox.
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If you have a lathe, could you cut the gearbox output shaft and re-tap the hole in the end?