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No outer framing. Basically eliminates about 86" of outer railing (assuming a 37" long by 27" wide bot). Center wheel is direct drive, so less chain (6 chains per average 6WD, 4 for your average 6WD WCD).
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How are you getting 86" I would think that you are only eliminating 74" of railing, though I have never built a WCD so I may be off. Also I have seen plenty of plain non-cantilevered 6WD robots with direct drive on the center wheels.
However I do know that with the WCD it allows for wheels to be removed much easier because the shafts do not need to be removed.