I think there was some talk a while back of stuffing a UCE into one of these Rickman frames?
EDIT: Forgot that there are complications with swapping gas tanks on these bikes, due to the location and function of the fuel pump.
I talked to Kevin about that, maybe a year or so ago.
I don't think it's going to happen.
However, I still may look at the option of doing Rickman frames for my Fireball 535 engines in the future, if things go well.