what i would like to do is fit a givi or similar top box. as hideous as it will look when i go touring i feel will be ideal with my soft tnt pannier luggage . now problem . is there ,and where if poss can 1 get a frame that just holds a top box on a trek . do they exicst are they custom made or does one have to resort to 12 kilos of blue tack and duckt tape . any info humerous or informative would be a help .