ORIGINAL: R/C Art
... also the filler pieces which go between the spars. Any place on the spars where I will be drilling through or screwing into needs to be strengthened. I use scrap wing spar material for the fill and then shear web with plywood to add strength back to the spars. This is where the outer struts will mount.
Art, I like what you are doing with the strut blocks. I'm thinking maybe the strut could be held in place with screws or bolts right through the wing from the top and bottom. i think the real ones were attached that way.
Jim