I appreciate all the insight. I believe, as you have discussed, that the 10% size disparity will be lost in the fact that not every American sailor in WWII broke the six foot height barrier. My plans for the figures are to have two on the starboard wing setting the timing and head space on the M2 .50 cals.; one sitting on the port wing reading a letter from home (his guns are loaded and ready for firing); one removing tape from the muzzle openings on the port wing and two behind the aircraft lugging a crate of ammunition. I might have one other figure lifting ammo boxes up to the starboard wing.
You all have mentioned gear as part of the scene. Right now there will be ammo boxes, ammo crates and wheel chocks in the immediate area. Off to the side there are six 55 gal steel drums (five standing and one on its side - all are meant to be empty). Additionally, there are two shell craters which have become filled with water. The Corsair is positioned on PSP (perforated steel plating) and I will put empty ammo crates under the ejection ports to collect spent brass casings and links. With the aircraft and the coconut log frame to lift the tail section, I think that is about as much as this 20 inch square diorama can handle.
Again, I appreciate your time and recommendations.