Thanks, that came out nice, however, Im not looking to put a top box on anytime soon. I've got an old GIVI E55 which has followed me on two bikes and 90k miles, been a great case. It will hold a bag of ice and a case of beer, just makes turning into corners challenging with all that weight up high sloshing around.
I may have to make a plate to clamp onto the luggage rack and some brace's similar to what youve done. Was hoping for aftermarket solution.