It's spelt 'monocoque' ;P but other than that I can't see any real problems* with it, nice work the same goes for the improved Drumblebee (which I can't be bothered to make a second post about, heh)

*having had a second glance I have noticed that you're lacking a bit in battery power - you probably do have enough weight to change to a pair of (or even three) 48v packs in parallel to give more capacity, so that won't be an issue