Here's the direction im going with the load bar mounts.

I really like the double bolt clamp setup. Im working on some ideas to make the bolts hidden, but without killing myself with the machining. If only I could use the CNC's at work!!! Then i'd make a nice "top" section that would be curved and have the bolts countersunk completely out of view... (still might go for something like that, just have to figure out how it'll go together within my home-workshop machine capabilities and without taking a day per mount).

SIDE NOTE: Not bad work considering i did these 1 handed (got a passed out infant on my left shoulder).