I've got this idea for a DIY topcase and I wanted to see if I'm nuts for even considering it.
The GIVI's look like nothing more than a plastic tote container, so...
I had this idea of mounting a Rubbermaid Action Packer Storage Box to the back of my R100RS. It is lockable, should be reasonably waterproof, and a lot cheaper than the competition.
The tough part would be designing a mount to hold it as my existing rear luggage rack is only held on by two bolts into the plastic tail piece. But, my idea is to sandwhich the bottom of the tote between two pieces of steel/aluminum/plywood. The bottom piece would be somehow securely attached to the bike. The top piece would be inside the tote, bolted through the tote to the bottom piece to keep it the tote from flexing. As long as nothing too heavy (the GIVI is only rated at 22#) is in there it should work fine, right?
I know the rack/mount will be the difficult part, but is it insurmountable? Does anyone currently make a rear rack for the R100RS/RT that is secured to the frame?