Jim,
Excellent points!
I would also add that you'd need a decent amount of wing area, say 1000sq in to start.

Maybe use the new Stinger 120 ARF as a starting point to scratch...I've heard of an RCS 1.40 on a U-Can-3D...

You'd have to do some serious mods to get it light though..

I don't want to get too far off on the Design aspects of the airframe....as interesting as I find Design...(I can start a "design" thread in that forum) MORE OF the simple idea of getting a Ryobi to hover and IF it's actually been done.

CrazyHerb