I am painting the aircraft myself and I have wondering how to paint the wings properly. Many rotisseries are made for aircraft with a strut but that will not work with this type of wing.
I noticed a jig made for wing construction and saw that a modified engine mount may do the trick. A center beam was place to extend the reach out to about the center distance of the wing. Next, 3/8 plate steel was welded and drilled to form the same structure as the aircraft center spar box.
This arrangement will allow me to rotate the wing in the paint booth to allow better spray position