The root ribs are made from 3/16" balsa, reinforced with carbon fiber.

As far as general wing set-up goes, I like to use two nylon 1/4-20 bolts with wing nuts per wing panel to hold the wings on. This may be overkill as far as simply holding the wing panels on, but it has the benefit of making the wings extremely rigid. There is no slop when the wings are bolted on. There are square lightply plates for the bolts to secure to. I use one Gator wing adjustor per panel. I am reusing old adjustors from some of my old dearly departed aircraft, so I had to make new sockets. I searched high and low for the correct dimensions with no luck. I ended up using the correct OD phenolic tubing that I drilled out to the correct ID. End grain balsa blocks are glued to the rib to anchor the sockets.

The stab ribs use similar materials as the wings. Gator stab adjustors are courtesy of my buddy Tim. To mount the stab, I use 4x40 screws going into the ends of the stab tube.