Carrying a small kayak atop an Island

I wanted to carry a small kayak along with my Tandem Island on the trailer. So I came up with a PVC structure to fit atop the TI to carry that kayak. The main idea is 4 cutoff PVC tees that rest on the crossbars and a frame that rests on those tees and allows the mast to fit beneath. Then I use the Hobie strap and some bungees or other tie downs to hold the small kayak in place. I have not tested it over long distances but it has worked well over several shorter (10-20 mile) trips.

Photo album:
https://goo.gl/photos/HHvCPuL9bJ8dJxpP6

That's an excellent idea. I'm going to see if it would work for my Revo 13 but place the kayak right side up as with PVC bunks for those occasional times I want to take kayakless friends to the lake.
Thanks for posting.
Chris