NOTE:
If you want a tapered wing, you have to trace your template onto the foam BEFORE you cut the slot for the dihedral (but after you mark the middle of the wing). You only need one wing template and you turn it over for the other wing. It's much easier to make your template with only one wing (and you get both wings the same). The main idea of having a one wing template.
NOTE:
Make sure you wait a few hours for the PVA glue to dry, before you remove the tape from the wing. When I'm working on a project, I usually try to work towards glueing stuff before I go to bed. And if something isn't quite ready for glueing, I try to finish it (and glue it) before going to bed.