David would appear to have the correct interpretation. Probably no problem with <R04>, but probably a problem with <R35>. This topic has been hit multiple times in the Q&A system (see
here,
here,
here,
and most directly, here: "The only cuts allowed in bumpers are vertical cuts, completely through the bumper, and perpendicular to the plywood. Bumpers may have gaps as shown in Figure 5-1 in <R35>.").
That aside, it is a nice looking robot. Like Greg Perkins, I am impressed by your solution for dumping the balls back out. Very ingenious!
-dave