Hey Red, I have some information via some reference books I have and am a fan of all of the AC aircraft. If you have any specific questions I can see what I can find for you.
As far as A-Models kits.... RUN AWAY! Use it for fish structure in the lake! Burn it!
I built a A-Model Boeing 307, Voyager and Pits Special and they were horrible fitting kits. After much fighting and arguing with them they didn't turn out half bad, but have your filler putty and sandpaper ready, and plan on doing lots of dry fitting before gluing.
On the other hand I have built the Italeri AC-47 and AC-119 in 1/72nd scale and the AC-130A in 1/48 scale and all three are excellent kits with lots of detail and good fit.
Good luck on the AC-123, I would like to see it when you are finished.