The biggest problem with MGS is the concept or the idea mated with some very marginal physics. It's not founded in any operational reality that I am aware of, and I guess came from sometime of "flow down" reasoning based on the idea that a SBCT had to have some type of "Big Gun", as an article of faith, rather than any OA that may have suggested otherwise.

The Aussies put a 76mm gun a an M-113 using the turret we had on the Saladin 6x6, and then there was the 90mm Cockerill eqipped CVR-T. Those worked, because they were comparatively simple and easy to do. MGS strikes me as the opposite.