RE: cardboard airplane plans!
Expect to be disappointed.
These specialty models require some experience to be flown successfully.
I've built a few flat planes from foam board and Depron foam, some of which are fliers, and others are miserable failures.
The exotic looking types like the F-22 and F-117 were the m.f.'s.
The flying wing and delta flew very well as gliders.
Stick with conventional layouts for your first efforts, and you'll be a lot happier with the results.