It's upside down. Got all supports on, time for top plywood cover then some plastic. Maybe adding triangle side supports that stick out, but I don't know yet?
It's upside down so those bottom 2x4s aren't going to be on the bottom when it's done. Also I had originally planned only 8(1 for each foot) but decided to add in extra because I figured supports there in that spot are going to be pretty crucial.