The F-16 was a Byron. It was the third one made. And probably the first one that had retracts, I used Robart 90 degree rotating mechanical retracts for the mains and sonictronics air cylinders. I built a total of 16, Byron F-16's all together. The last one I had I used the fuse for a plug and made a mold that was the full length. Dennis Fuentes still has that mold. The F-100 is the same one that Art Johnson designed and built. We worked on both of them together, there were almost 100% identical. About the only difference was the way the Byron Fan unit was mounted. Mine the head of the engine was up, and his was down. I also used Rossi engines. I think Art used a Pico. It was kinda neat building two of the same models at the same time. The model was in the RCM magazine. We must have had 50 sheets of parts drawn. Art did all the drawing. I did most of the cutting using a router table with jigs. I threw the jigs away last year.