I like the idea of a removeable topbox and the way the givi fits to Dale's rack. You managed to use the mounting holes already in the rack and did not have to drill anything. I am looking at a similar set up, I want to have the bike without topbox when riding solo, then mount the topbox when riding with a pillion, hopefully so that it will also serve as a backrest.
Can you tell me, if the bike did not have the Honda backrest fitted, could you mount the Givi further forward to achieve this? Would the rack need to be drilled or does the rack have other mounting holes.
I have put a wanted add on the forum, I am looking for the rear rack mounting brackets. When I find them I can start experimenting.