Hi Al,
Just thinking how cool this Bearcat would look with retracts! The circuit can be made quite easily if you want one, and the modern electric retracts are simple as well. You could even set the speed of pulling the gear up or make one go in before the other etc. The old idea from a published circuit used a small microphone on the board and as soon as the engine quits, it pops the wheels out. With all of that space inside that nose and fuselage, the same circuit could be used with a small servo to shut off the engine as well, so you don't have to wait for the fuel to run out completely. Just a thought.........and yes, I am volunteering to make this gadget for you! Be well.
Keith R