RE: Ironing on Balsa sheeting
It works well on a built-up wing and I did use it once on a .25 sized, foam wing design. I used carbon fiber spars and 1/32" sheeting. You paint wihte glue on both the foam and the wood and let both sides dry. Position it in place and iron down. With 1/16" balsa, you may have to get too hot for foam. I sheeted the leading and trailing edge and did fake cap strips. A couple of times I slipped off the cap strip and the iron easily melted the foam.
Caution, you are not melting the glue, you are activating it. You get one chance. There is no heating it up to reposition it. Once the glue is activated, it's stuck forever. Practice on scrap first.