David,

Nice drawings. I agree on the reduced thickness. Didn't realize you had CAD capability. Can you draw up a wing to my design specs (pricing? PM me please)? I would want to have a couple sets of ribs laser cut. That's to prove a point between foam/balsa versus built up ribs.

Be careful of the interlocking but glueless shear webs. I really like the interlocking feature but I would glue them to the spars and ribs. I don't think you want shear webs to float against the spars and ribs. Vibration will wear the contact points out fairly quickly