Hi there,
I want to add a little workshop area in the corner of my garage. The intention is to place it in the area highlighted in red, and I am planning on having some storage shelves at the top with a pin board for my tools and work bench that I can store items underneath.
However, to get started I need something secure to secure items like the shelves to. Should I be using framing timber to create between the metal beams then secure some particle board? Not sure what the best approach is and would appreciate some thoughts!

Thanks!