Bumpers sticking out 1" beyond frame perimeter

[jamesmcip]

Today we have finally made our bumpers and decided to have it flush with the frame perimeter on all sides except for the front, which would have a gap of 1" between the plywood of the bumper and the front of our chassis. We assumed, as per rule R26, that if we supported the bumper at least every 8" we could have a gap between the frame perimeter and bumpers as long as we wished, within common sense of course.

However, we just realized that this may be a violation of R21B, which essentially states that hard bumper parts must not extend more than 1 inch away from the frame perimeter.

Is it legal to extend the bumpers in this manner?