I used ceiling tiles for years and never had any real problems with them other than initially getting the 2'x4' tiles to lie flat. A year or so ago I purchased the balsa building boards from Great Planes and find them so much nicer to use. They remain flat, hold pins in a secure manner, and can be placed back in their protective shipping containers, where they remain flat, when not in use. A very neat alternative to replacing tiles when finished with a build.

Soft landings.

Joe