Dane,
I do about the same thing, but I leave a 1/8” gap between the fuse and wing covering. You need a fillet in that joint to guard against vibration, promote better engine runs, and increase longevity of the model. After the fillet is made, cut a 3/8” strip of covering and iron that to the fillet attaching the covering of the filler, fuse, and wing covering. The other option would be to paint the fuselage and fillet then cover the wing overlapping the fillet slightly.
Later,
Mikey