Question about using plywood
I have started making a blanket chest for my OL's sister for her graduation, and I pretty much planned on copying the design from one I made in High school. I have now decided that I want to change it slightly. I was thinking that I would use plywood for the bottom, and rabbet the edges of the bottom to fit into dado's in all 4 sides of the chest. If I use plywood, do I have to factor in at all for expansion/contraction, or can I size it for a perfect fit without risking damage to the chest with changing humidity? Thanks in advance for any help.