Hi Jim,
During testing, I noticed that the underside was hard to see. I had used a white band about 10" wide but it did not help with the visibility. Today I sprayed a band of flame-red about 8" wide one each wing that should provide a better contrast with the yellow and more recent white band. Flame-red is pretty close to the pre-painted version colors.

I noticed that the wing roots have sharp edges that cut into the fuselage sides with engine vibration. I have since added some 1/4" balsa spacers at the front of the root rib to provide more of a flat surface area to press against the fuselage side. The wood can be sanded flush. In a similar fashion the wing bolt has been supported to avoid the fuselage sides bowing out as the "wing" nut is tightened.

Regards,

Eric.