I am not worried about cutting the wood. I have access to a wood shop. My problem is the type of wood. Most racks are designed to fit the tubs without lids between the shelves. I am wondering if I do that with a veneer plywood that is not sealed, if the humidity, over time, will destroy the wood? Not to mention the sanitary conditions it may present.

If it is going to be a problem, I will design the rack so that the lids will remain on the tubs.