Option 3 would be the most straightforward to implement and regulate, although I'm not 100% that it is of benefit to axes and crushers much as top armour could still be quite thick. The only thing would be, how much of the robot would a ground clearance rule cover? For example, the old Drumroll (so Boner) has a ground clearance at the back of roughly 20mm, but the front of the robot rests on the chassis so the GC varies from 20mm to 0mm. This could be true of several other robots. With Boner, there is space under the drum (if you're tough enough) to get a flipper or wedge under and lift it up. But another robot might have that 0mm all the way across at the front. Maybe there needs to be something about the 'leading edge' of a wedge robot being 3mm off the ground?
Dunno, definitely needs to be thought out and implemented well but I agree that something needs to change to get more diversity. Certainly a worthwhile discussion.
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