Dave, One piece of wood as a base and two wooden dowels with a slightly rounded off point on one end of each dowel. If they are 1/4" dowels then you need two 1/4" holes in the base at 14 1/2" seperation center to center to stand the dowels in. That will put them directly under the spars. Since you don't have the little swivel things for the top you can use double sided tape stuck to the wing, that will prevent the dowels from puncturing the wing and you can put marks on the tape for your CG. Cheap and easy. As far as your point A,B and C theory, well......whenever you do drapes you seem to go off the deep end. Joe