Stackable 12x12 tray to hold precut plywood, cardstock, acrylic. I made the bottom into two separate pieces with a dove tail splice to make it easier to make from smaller sheets. I made it from 3mm black cast acrylic but it could also be made from 3mm plywood.
this simple to put together. just keep in mind their are 2 different side pieces make sure they go across from each other.