[Tristan Lall]

Under current rules (this wasn't true in 2008, for example), if the bumper bracket is not intended to be removed from the bumper, it counts toward the bumper weight and not the robot weight. (Note that in the case where the bumper bracket is both removable and structural with regard to the robot, and still serves as a fastening method for the bumper, you may encounter an inspector who instead interprets your design as a not-quick-enough bumper removal method—wood screws—and a robot structural member that happens to be removable. You may have to discuss your intent with him, and see if he agrees with your interpretation—there's a good chance that you'll receive the benefit of the doubt.)

Also note that if your wood screws (attaching the clamping angle) protrude from the bumper, you need to consider whether they lie on the frame perimeter, or whether the angle or plywood lie on the frame perimeter instead. By <R07I>, "BUMPERS must attach to the FRAME PERIMETER" (not the clearest directive, given what the frame perimeter is), but there's apparently no prohibition on penetrating the frame perimeter to do things other than attach.

You may also want to ask the Q&A about the 1 in limit of hard parts (measured from the frame perimeter). It appears that it doesn't apply in the inward direction (though the existing question and answer dealing with that might both have been clearer). This has significant implications for the design of "multi-part attachment systems".