I know I won't be able to get this done before the challenge ends, but as I have gone down hill some in health again lately I decided just to take a stab at this!
Simple 3d printed parts to mount the eflite retracts to. I used the ones from their Beech 18 but others may work aswell. I also have a tail wheel and towline hook file if you want to use this as a tow plane.
If anyone wants to mod the file I can send you a copy, they were designed in Onshape...