SkyShark uses the following system for their ailerons, rudder and elevators.
1/4" thick leading edge.
1/16" balsa sheet CA to the center of the LE.
1/2 ribs of 1/16" balsa CA toboth sides of the balsa sheet and LE.
Quite strong and very light. Check the online manuals at their web site.
SkyShark
http://www.skysharkrc.com/