That's rather cool, UVS. The T20 used an early HVSS suspension, so that would be an even closer match to your mock-up. I think the main problem with the various experimental Sherman replacements is that the vertical volute suspension was inadequate for the weight.
It would be good if tanks like this got some attention in addition to the 'paper panzers'. World of Tanks puts more obscure tanks like this on the battlefield, and although it's all rather silly it is cool to see vehicles that never got past the prototype stage rolling around a virtual battlefield - like the Australian Sentinel, and the various (aborted) US heavies. Maybe with the success of that game, model manufacturers will get more adventurous with their choice of subjects. Once they've covered the vehicles that actually saw service, that is.