I ran into the same problem installing the bulkhead shelf. I gave it a trial fit after installing the bulkhead. It was a very tight fit and it looked like it would interfere with the door framing so I held off on the shelf until after the framing was glued in place. Of course there was no getting the shelf in place without risking damage to the TD skin once the framing was in. I wound up shaving 3 or 4 mm off each end of the shelf. This left a pretty large gap between the shelf and skin to bridge with an unsupported fillet. I thought about adding some fiberglass tape but just put an extra fat fillet where the shelf meets the door frame. It looks solid but I will keep an eye on it when I get on the road. IMO the manual needs to be corrected to showing the shelf either tacked or filleted in place before the door frames are installed.