Thank you for the reply, Ron. You've a real nice setup. I've called Backroads, and spoke to Steve who's a very good guy. He even sent me PDF drawings of his generic plate w/ dimensions. My plan was to mount his "puck style" system to the top of a Seals aux tank. Lincoln and I are still trying to sort out how to mount it on a K16. Looks like it's going to be a while.
So for now, I'm hoping for just a Pelican on the rear rack. But my local fab shops aren't real interested in such a small project. I was thinking of getting that generic plate/puck system. Then sit out in the garage and meditate for while to see if I can come up with a way to bolt the thing on.