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After fitting the skins I had to acknowledge that my support of the wings while skinning them has been shaky, literally.  I got very worried I was going to crease the skins, so I made up two wing stands for each side of the wing.  I used the wing rib forming blocks for the top and bottom cross sections.  They are not made to extremely close tolerances, but when the wings are in them they are held firmly and level.

The two pictures below show how the top and bottom cross sections fit. I have two top and two bottom stands.
      I also made two wing stands that hold the unskinned wing vertically by the spar.  The first picture shows the wood for these all cut. The second picture shows two top surface stands sitting on top of the two vertical frame stands.