I just looked on RCScaleBuilders and Albeit started a thread there and never finished it or got very far. On the retracts, I have had different F16 jets that have had gear that swing the same way that the Cessna series of retract planes swing their gear. I would just mount a regular retract, with my favorite being Behotec, at a 45 degree angle to the ground swinging back. The one that Radical made for the smaller one is just too complicated for the same thing with two servos operating it. The strut would be the next hurtle to accomplish.