What do you mean by 2x snowplow-like scoops, one on the front, and one on the back. These have a little bit of vertical mobility, so the wheels can touch the ground

I just dont get that. And in addition, I may be wrong, but depending on higher knowledge on Bosch 750w motors, I think that your robot will have around the 4hp or 14hp mark - try LEM130s at 36V, as for certain you will have 18hp.