Worked on storage shelving constructed from shipping crate plywood plus OSB board. Uprights were ripped 2x4x10's with 5/8" notches sawn for the shelves. Each shelf was attached to the uprights with a single 1.5" screw from the shipping crate. Nine of the shelves were cut from the 9/16" plywood from the top of the shipping crate. The other 3 shelves were from 9/16" OSB board. The tops of the uprights were tied to an eyebolt attached to a floor joist in the ceiling of the garage. The 19" x 48" size was chosen to maximize usage of the crate plywood.