It's a very interesting series. The quad-track setup is a distinctive, practically signature design feature of a BOLO, as it reduces ground pressure, and distributes the vehicle's weight much better than the traditional two-track design.
It solves alot of issues and provides infantry support organically to the MBT (which is vital), however it would be very difficult to maintain because it is like maintaining two tanks in one with separate drive wheels, so would this behemoth require two engines?
Another drawback are IED/MINEs would have a field day with this thing because the biggest weakness for a tank is the belly which is hardly armored at all, and is flat.
I am toying with sketching a V-Bottomed Hull for a MBT like a MRAP has.
Otherwise your tank design is really finely detailed and well thought out, it actually might look like a real production tank! I wouldn't worry about the size because tanks will make a comeback due to advances in Anti Tank missile technology like what the Israeli's made with the Trophy system.