Well I've inventoried and building has begun. Here are pics of the first 3 ribs in place. I lightly sanded the notches left on the wood from the cutting and fit them before gluing making sure they were flat on the board and in contact with the main spar. I'm just using a drop of glue (titebond), spreading it with a small scrap of balsa and then putting the pieces together. then spreading the glue along the outside of the joint using the same scrap of wood. Is this acceptable? Any other methods?