titanpat57 wrote:I would think in your location , you'd be able to find a cabinet shop or would supplier to commercial contractors that would easily be able to locate 5' wide and probably up to 10' long if you need it.
You're probably right. There are lots of commercial suppliers in my area according to Google Maps. The big question is whether the extra cost will be justified by stronger walls. If I spliced a 4x8 1/4 plywood sheet against a 1x8 section to make a 5x8: If I backed the seams on 1x3 wall studs, put the outer seam at 4 feet up, and the inner seam at 1 foot up so they are staggered, I would have pretty strong wall.