Nony,
I finally figured out the geometry. I'm going to make a couple of "L" brackets that will be mounted by the forward retract mount holes and another bracket on the inside of the door. I'll use 2-56 rods with a nylon mini clevis on one end and solder a piece of brass for the rear pivot. I'm going to operate it with a small air cylinder that I hope I can time with the retract so the door and the N/G operate together. The only thing I'm concerned about is, because of the air loads, the top of the door might dig into the top opening in the nose cap when the door opens, jamming the door and breaking it. I think if I put in a bevel on the nose and the top of the door it should be OK.
I'm going to try to set it up tomorrow, if it works I'll take a couple of pictures.
BRG,
Jon