WACO put blocks of wood around the wing strut fittings to provide a place to attach the fabric. They tacked the fabric to the blocks. Today, using synthetic fabrics, we would glue the fabric to the blocks. For a lot of planes you just make slits in the fabric for the fittings to stick through and then put reinforcing tapes or patches around the fittings. Using the blocks makes a more finished job, you still put tapes or a patch.
On the outboard side of the strut fitting, 2 pieces of 1/4" plywood are used to make it level with the wing rib.
I put a small block of spruce under each unsupported end of the plywood.
The diagonal, flying wire, end of the fittings has a piece of 1/4" spruce between them.
The blocks on the sides of the spar are 5/8" square spruce. A saw kerf along one side of the block provides clearance for the fitting.
The fitting prevents gluing most of the block to the spar so I've added a support block, glued to the rib.
The joy of having enough clamps when you need them.
Because of the aileron cut out, the rear spar is a little simpler. There is just the block between the fittings and another piece of the 5/8" spruce on the inboard side.
I notched and glued the end of the stick to the rib stick and put a small block under it just to be sure it was supported.
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