Got a few free comments on the pipe dream rack. Ditch the rear seat cover and use the rear seat to support some of your load. That will help get your CG (center of gravity) closer to the heart of the bike. I use a dry bag with Rockstraps, sp? to hold mine in place ...on my KTM Adventure and Tiumph Tiger. I camp out so I stuff my tent, sleeping bag, sleeping pad, and a chair in the dry bag and sinch it down to the seat. Your diving board will want to shake, rattle and roll your bike, before it breaks off.
Don't take this as a slam on your design..it's just what I see...
p.s. I make a living as a mechanical designer.