My plan is going for a low profile APC based on the Sherman tank.
I had initially planned to fit a M-113 ramp for ingress / egress.
Initial concern was that the Sherman height wasn't adequate for an APC
However still going for an APC because of :
1 - Low profile APCs abounds in real world - IDF conversions of the T-54/55 and Centurion tank hulls
2 - External VVSS allows adequate interior space for troops (albeit severely cramped!)
Thanks for making BtS so great :)