OK.
First, I had a rack installed for the topcase on the bike from SHAD. This left me with two mounting points on the top. The front one I bolted the mounting plate directly to that came with the JC Whitney cases. On the top rear I used a scrap piece of flatbar to bend out a bracket to the plate. Then on the rear bottom of the plate I used a straight piece of bar to extend backwards so I could run a threaded rod across the back joining the plates on each side together. I think the picture on the rear might give some idea. If I get a chance, I'll take a picture with the cases off.
The threaded rod cost $2.00 at Canadian Tire while the flatbar I had lying around the garage. I also purchased a couple washers and a few bolts. So perhaps closer to $7-8.00 but definitely way under $10.00.
Not necessarily "pretty, but I only use them on long trips and the way it is designed I remove two bolts on each side and the rack comes off.
Make sense?
Also, does the angle of the bags look ok or are they too low on the front?