looks like a tough sucker. st10 is not necessarily a waste in IF like it is in DSL (since the chassis armor is tougher here) but there may be better things to use it on.
the main thing I'm concerned about is its lack of invertibility though. I know it'll be a pain to figure out a solution with your weapon system but it's needed honestly. without changing anything major, a system that might work is to give it tracks and attach a few ~60cm extenders to the top of your hex plates. your weapon won't hit squat when youre inverted but it's better than being immobilized.
your wedge will also probably be pretty weak with that setup. I recommend two medium angled skirts as far apart as you can put them on.
other than that, it looks pretty solid. I would recommend from personal experience to shove a couple of ballasts in there just so it doesn't get knocked around as much and amp up the grip on your wheels a bit to compensate. with st10 you should have plenty of weight.