For anybody who might be interested, check out
http://www.waraircraftreplicas.com/ for 50% scale plans for the Fw190, F4U, Bf109, Seafury, A6M, P51, P26, P40, P47, and the Hurricane. From what I remember when I use to frequent this site and forums, the F4U and Fw190 where the most popular by far.
I always thought the P26 would be interesting to build and fly because of its open cockpit and fix landing gear.