More filling, sanding, proming and repeat.... all looking good. After smoothing off the transition between the tanks and wings, used a very fine tennon saw to score the filler along the line of the join between the panels so that the tank can be removed later if required. Mounted the ailerons and flaps and checked alignment again. Repainted the main control rod to ailerons as they had got a bit scratched during the build. Fabricated a mounting plate to fix bulkhead circular sockets to.