I built a wing jig from the instructions on this page.
http://webpages.charter.net/rcfu/Con.../WJConstr.html

It is simple to build and works really well. Make sure you wipe the alignment rods lightly with oil before building your wing. It makes the wing much easier to remove in the event that some glue gets onto the rods. Don't ask me how I know.

I've attached a picture of the one I made.