Gday Rappa, ive done the same as fatboy same idea ive used another sports bar which fits tub profile nice then had flat aluminium folded to sports bar profile to form curve used same guy as FB for canvas , i used the existing tonneau cover track at front to slide canvas into to create extra seal at front also used existing tonneau bungee fixings on side, pretty happy with outcome no leaks also have new rhino rack mounted up through my bars, good luck with it all.