Here's a great site with info on recognition models. They sell replicas (I think in Bakelite or plastic), but they're pretty expensive:
http://www.aircraftmodels.com/idrecog.htm
No plans, however.
This site has some history on them:
http://www.72scale.com/history.htm
I've got an old book on building wooden airplane models, but I just moved, so I'll have a heck of a time digging it out. When I do, however, I'll post the title and maybe a sample scan.
Regards,