I designed a jig (horizontal drill press) to bore the wing tube holes. I amazed myself at the end results. Hahaha. I used a fostner bit to produce a very clean and actuate hole. I'll try and find pics of the jig since it's been years(8 yrs I think) since I last worked on this ship. The wings and stab were sheeted with contest grade 1/16" balsa and glued down with Gorilla glue. The wing and stab skins are still in excellent condition since they've been stored in the foam chucks.