Chassis material for PFC v.3.0

Has anyone tried using 1/4" plywood cut with CNC for the chassis?

It could work, but I think you would need to paint it or coat it. Wood has a lot of fine crevices that can hold fungus, algae and bacteria; making it harder to clean. You may also have moisture problems (though my cardboard MVP has held up well for several years). Give it a try and let us know how it goes.