Egor,

I might just keep the bay size length to 6" in order to generally keep the bay under the CG and this gives me plenty of room for the radio gear and servos. After your response, I did a lot of searching on google and found a lot of things. I was doing my searching here on rcuniverse and didn't think about elsewhere for some reason. Still looking for some pictures of an operating bay doors setup.

It's a shame Servo City now charges for shipping. I might call them up and quiz them on various servos etc. I did find a site that took a Kadet and lifted 12 lbs. or so of cargo! One guy made a bush plane out of his with extra tank, Trexler ballon tires and a three bladed prop. That was nice.

Thanks for all your help, and others too. I couldn't imagine going through this r/c experience without the internet.

Greg