Built this GIZMO per instructions to bend the elevator skins.  1 2x8x8 cut in half and 3 hinges.

This tool bends the skins absolutely perfect.

Still needs a little bending but this will do for fitment of the subassembly and final drilling.

Wondered from day one how and where this horn was going to fit.

The skin came out so smooth I couldn't resist removing the protective covering to see how it was going to look.

Look at that!  DANG!  This is what makes me motivated to finish the rest!