I'm back.
The big question I must deal with is whether the weight will end up the same as it did in my last GP Super Stearman, which I set up with a 30CC gas engine. I'm thinking it will be lighter, and that means I should keep the servos forward with this electric setup, which I believe will weigh less in the nose. So, I'll use the servo tray for the two elevator servos (JR St126MG's), and the rods will be the Central Hobbies carbon fiber rods with the 3/16" X 4-40 Titanium tips as described above. The elevators have the DuBro double horns for mounting a large ball-link between them, so there won't be any slop.

The rudder will have to wait until I learn where the CG falls. I can use the servo for the rudder as ballast if the tail comes out a little light. I was considering pull-pull for the rudder, but I'll probably just use a single carbon fiber rod.

What may turn out to be the most difficult part of this build is finding the ideal spot for mounting the batteries where they can be accessed and removed easily for charging, both at the field and at home. It's a pretty big plane, and the batteries will fit cross-ways in the fuselage. They're pretty chunky, but only about five or five and a half inches long. I've been playing with a chassis/cartridge setup that allows the batteries to slide out once the hatch is removed, but that presents its own set of daunting engineering challenges. I decided that putting a hatch big enough for two of the batteries can't be done vertically in the nose without risking the structural strength, so it will have to be a horizontal hatch. It'll have to be curved to match the fuselage curve, so it won't be a piece of cake, and once you take a good look at the nose, you soon see that the cockpit floor and front wall and the upper wing mount bracket anchors and interior formers and such really limit the spots you can cut open to make a hatch.

I'm still working at this, so if anyone has created a working system in theirs, I'd love to hear about it. As they say, imitation is the sincerest form of flattery, and I of course would be happy to steal and use your design if it's a good one!

The alternative is charging the batteries in the plane, and where battery fires during charging are a rarity these days, I've seen a few, and they're scary. I also try not to charge batteries at the highest rated charge; I'm just never in that much of a hurry to have something ready to fly right this minute.

But I thought it would be nice to be able to change out the batteries right at the field and fly again.

Jim