Originally Posted by
52larry52
If the plans have been rolled and stored for say 10 years, then after rerolling them in the opposite direction you must store them for another 10 years rolled that way for them to be flat.

Or you could just pin, tape, and thumbtack them to your building board and get on with the build.
Just about every kit I build is over 20 years old. You're right. I just lay the plans out, secure the corners, and build from them.