SirC,

Tony Elmore, in the UK, has a great site with scans of stunt model feature articles from AeroModeller and the old Ian Allen Model Aircraft magazines. One published design I saw there had the very deep airfoil unfortunately displayed in your photos. The size overall also fits that Spitfire. Try this site - if I've copied it correctly -

http://www.the.elmores.btinternet.co...s/_cat001.html

If the link automatically underlines, there is an underscore between the final foward slash and "cat001.html."

A very interesting site!

Luck!