I used two 12" servo extensions in the tail end of mine and no extensions on the ailerons. As to the pushrods, the only one I needed to replace was one on the tail, and I just used one that I had lying around from an old hanger 9 trainer that was totaled during the learning process a few years ago.

Wound up getting a .50 SX for this plane as the hobby shop didn't have any Saito .72's and I didn't think a .58 would be enough. Just hope the 50SX fits the engine rails.