I think the Kyosho Lear is a bit large for GWS EDF50s. Besides, it's out of production, no longer available, and it came with its own fans and motors anyway... The only one I know of is owned by Nick Ziroli Sr..

Hmm, finding a Lear or Gulfstream kit for GWS EDF50s... That's a toughie. You may be on your own here, as neither of these models is a very popular subject, definitely not popular enough to warrant a production kit. Yet.

They're doing wonderful things with fan-fold-foam these days. You might want to check into the fan-fold-fenomenon, as the lightweight planes that result from fan-fold construction are ideal for the lackluster performance of the EDF50s.