ORIGINAL: Ilikebipes
Foam core flying surfaces sheeted with lite ply seems reasonable.
Brian,
I sheeted a foam wing with 1/64" ply years ago and it worked out well. One thing to keep in mind if you decide to try it.......since the ply is so thin[.015"] any imperfections in the cores will show up after the ply is applied and you won't be able to sand out the flaws. So the cores need to be as close to perfect as you can make them.
RG