[GaryVoshol]

The Frame Perimeter is defined by the outermost edges of all Robot parts between 2 and 10 inches from the floor. You have to be able to attach Bumpers on all those outermost edges.

That doesn't prohibit having other "frame" parts below 2" or above 10". The rules don't even define what a "frame" is. No parts can be outside the Frame Perimeter in your Starting Configuration. (Rule R4, the so-called "mushroom bot" rule.)