I'm digging it, so essentially turning that body into a massive ducted fan. If it does only use the jet engine sparingly it would make sense, even keeping true to its original anime form in the movie "nausicaa and the valley of the wind". if you are into anime and haven't seen the film shame on you. In the movie it jet bursts to altitude and then glides, only using the engine for more than bursts occasionally. but if you didn't catch it, here is the video of the 1/5 scale jet powered rc version and it flies like a mofre http://www.youtube.com/watch?v=3Nkc-Rhgb7YLock.
I have been trying to figure out a way to make a top riding light aircraft for quite some time and since it's called opensky, I sure hope they are open source because I'm going to be "borrowing" quite a bit from their design. If that fan generates 28lbs I wonder how much force the prop units out there produce.
I just found the specs on the electraflyer and it says the thrust generated is 140lbs. So you would have to upgrade the power of the fan design to five times greater output but doesn't seem out of the realm of possibility.