Ok I get it not a plane to be concerned about weight. Never had a cub I am flying a Decathlon pretty close.Two thoughts Snoopy, other than the steel tubing added around the cabin/ forward fuse area I'm building according to plans. In other words I'm assuming it is a proven design. Secondly, Cubs are hard to land, there is so much lift you almost have to force them down.
If I may suggest I have been using carbon rods for a while. Had a couple of failures using carbon rod and threaded rod epoxy into the ends. After some carnage I figured out how to stop the carbon rod failure. If look at the picture. Solved the problem by epoxying a sleeve over end where the threaded rob is glued in the carbon rod. This stoped the carbon from splitting.Control area filling in. Other than balance/cg worries this is where the plane show and not many other possible locations.
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More food for thought, 4 mm cf tube, 2 pieces of 3/16" x .049 aluminum tube (KS 83060) 3/4" long. face both sides, drill one end 5/32" diameter 3/8" deep. The aluminum ends are glued on the cf tube with black rubberized CA, after cure tap the aluminum ends into the cf tube for 4-40 threads and install 1 1/4" long 4-40 socket head cap screws and remove head. I have used both rubberized CA and red Loctite while installing the screws. The rods are bullet proof. For short rods the KS 83060 is perfect, just tap for 4-40.If I may suggest I have been using carbon rods for a while. Had a couple of failures using carbon rod and threaded rod epoxy into the ends. After some carnage I figured out how to stop the carbon rod failure. If look at the picture. Solved the problem by epoxying a sleeve over end where the threaded rob is glued in the carbon rod. This stoped the carbon from splitting.