Heres the one and only guy (as far as Iam aware) whos come even close to a proper power system and airframe-
http://cpl.usc.edu/eschuste/
Problem as I see it is really designing the functional puffer jet duct work and also sourcing enough useful puffer air pressure so as to be funtional.... Checkout the functional turbofan and video that is intended to eventually power the 1/6 scale Harrier airframe.