It took a while for me to decide weather or not to add a wing tank, due to the cost involved and the added work.
In the end, It was decided to just do it.
The main tank only holds about 12 gallons of usable fuel, and with the addition of the wing the Cubby will hold 22 usable.
It was necessary to move end bracing to the next rib in, and temporarily remove the drag/anti-drag wires.