I haven't checked in on this thread in quite a while - the last BF upgrade isn't working all that well on my computer (or maybe its just me who doesn't get it?). Anyway, glad to hear he's progressing.

The Catrike: My neighbor has multiple sclerosis which progressed to the point he couldn't go jogging anymore, and his balance is off, so he bought a Catrike for really cheap. I've gone out with him a few times on a local MUP and he seems to do quite well on it. He initially bauked at my advice to go out early in the morning (like even before sunrise when the eastern sky starts getting light), but found it to be best since that's when the MUP is the least occupied (and he doesn't have to be concerned with the wide stance of the Catrike). He let me try the Catrike, but I'd prefer a two-wheeled recumbent (maybe a Raans) rather than the 3-wheel.