Clarification on Bumper Rules

[noa_n_f]

Our robot's chassis will be made from aluminum angle beam. The top and bottom halves of the chassis will be held apart by about 9 inches of more angle beam.

We plan on attaching the bumper on the bottom angle beam of the chassis, but seeing as the two beams are spaced 9 inches apart, the bumper (being five inches tall, according to the rules) will not reach both beams.

To add support to the bumper, we plan on placing aluminum flat beams between the main frame at 8 inch intervals (the rule states it must be supported every 8 inches).

My question is, does the bumper need to be supported on both the top and bottom, or will we still be within the rules if we support the bottom of the bumper and have vertical supports along the bumper's length?

Hopefully this is clear enough, thanks for the help.