Glenn,
I think that he may get taller, but should stay skinny for a while. Marriage is a long way off for a 14 year old.
Tonight I built my wing spars. Step 1: move junk, motorcycles, and tractor. Unscrew box.
Step 2: remove cardboard.
Step 3: put back junk, motorcycles, and tractor.
Ok, you guys can hate me now. It seems worth it.