[GaryVoshol]

If you want to follow the letter of the law, by building the kit frame as illustrated in the picture, you have actually created a very short 45-degree angled face to your BUMPER PERIMETER - somewhere in the neighborhood of 1.4 inches. This face has no frame backing to attach the BUMPER to. Never mind that you can't attach a 6" bumper to a 1.4" space.

Somebody please ask Q&A how to BUMPERize this corner. Following instructions given with kit parts should not lead you to violating the rules.