by NathanL » Thu Oct 21, 2010 8:56 am
You can get high quality plywood down to 1/64th of an inch in up to 4'x8' sheets if you look hard enough. Stuff like 1/64th, 1/32th, 1/16th etc...
It's the same stuff you see in hobby shops before it was cut.
Make sure it's labeled as aircraft ply or tells how many plys it has. Avoid stuff labeled "lite-ply" as it's just two junk face plys with an even junkier inside core with lots of voids.
Either BalsaUSA or LoneStar Balsa can special order it for you in oversize sheets but they'll stock up to 12"x48".