Sorry about the late post but I ended up getting side tracked by work.
I started on the wings yesterday. This involved a little bit of guesswork but I think I have it right. Unfortunately, after cutting out the spars, they got a little warped and twisted. I wet them with water and placed them under a heavy book to straighten them out. (This also caused some minor anxiety, when one of the spars stuck to the book so I couldn't find it!!)
Although they were still a little bent I put everything together ready for the skinning of the wings when thouroughly dry.