RE: How attach gear door to mains strut?
I'm sure someone with more experience will chime in, but I've had good success with drillling into the strtut, tapping it ffr 4-40 andd then drilling matching holes in the door. I then stick the bolt\washer through the door, then a 1\4" piece off fuel tubing, then into the gear leg. The tubbing allows he door to float just a touch. It works quite nicely. I hope this helps