I put wood dowels in the top and bottom of the wing. I cut a trench, then used sandpaper to round it out and poly glued the dowels in.

These planes are a lot of fun. The Hots I made ROCKS. This one will be great too, I just gotta get that big .68 off the front. Too much weight!!!!

Try pink foam. It's the same thing, just a different mfg.