http://s334.photobucket.com/albums/m422 ... 015721.jpg
Basic tank-ish silhouette, maybe a bit more "H" frame. The idea is salvaged technology reverse engineered from crashed alien AI tank drones. We've figured out anti-grav, but pretty much just lift. Propulsion and steering are achieved through conventional systems (small turbo fans, maybe internal combustion) using Harrier-esque thrust vectoring for steering. heavy armor and weaponry coupled with advanced yet not fully understood tech make for constant field breakdowns/repairs.
There will be a nice little backstory to it, told from the driver's/team leader's perspective, which should allow me to get away with not being overly technical about alien technologies!

The turret will have the requisite BFG, a remote mini chain gun, and some defensive SAMs, along with communications/radar arrays.