Built this: (I'll clean up my crappy welds and paint it tomorrow)
Nice work!
But... have you been following any of the rear sub-frame cracking threads? Your new rack, which I assume is intended to support some sort of a good sized soft tail bag, will place all of the weight of the bag solely on that weak rear subframe with no added support beyond the stock plastic grab-rails.
Sorry to be such a downer. Maybe you'll just be carrying feather pillows and marshmallows on there?