Tower has building boards out of 1" balsa up to 16" X 48". They are laminated so will not warp. I wouldn't be without mine although I have two benches, one standup height and one sit down level. Stand up is from a solid core door and is good for things that need pounding sit down bench is hollow core mahogany, soft for pins. To build I use the balsa board no matter the bench. If need be I can pick up what's on it and move it to a more convenient place (such as a closet if the boss shows up).