you might want to use plastic or rubber between the mount and you frame.
it looks like it wouldn't take much to turn it into saddle bag frames to ride with a passenger.
Yeah, I'm trying to find something thin enough to use. I had originally planned on using some rubber I had laying around that is meant for mounting speakers on wakeboard towers, but that ended up being too thick.
As far as saddlebags, yeah I'm sure someone could modify it to work that way, but I built it for my application, which won't include two-up riding, or a need for that much luggage.