I had some shelf brackets left over from another project and decided to make a mobile storage shelf system for larger parts. The metal brackets are designed to fit 2x4s. The brackets have pre-drilled holes for screws that are used to attach the brackets to the 2x4s.
I spaced the shelves to accomodate different sized parts. The overall structure is partially assembled in these pictures. The bottom shelf provides the most space in terms of height.