The supplied wood on this airplane kit is so close to "on size" that I could not extend the sheeting over the leading edge like I do on the SIG sumthin' extra. Afriend told me to buy 1/8" x 1/2" balsa and glue it to the aft side of the LE wood between the ribs. This gives a support for the LE skin between th ribs and will minimize the line in the covering from this joint. That works very well. I also bought and am using the Great Planes wing jig. I think it was almost $25.00 but with these ribs already having holes for the jig's rods, I thought it would be a good idea. I love it. Like building a wing on a shish kabob. It makes the process easier and prevents built in warps.