Just an idea, if you get no responses Corke Aero sell Spit panels, see

http://www.corke-aero.co.uk/spitfire.html

http://www.corke-aero.co.uk/index.html

Might be worth asking if they will do a deal where you borrow a panel off them and put an advert for them on your stand, just an idea… Hopefully someone will help you out.