Now that I managed to get some daylight into the container, I thought of the best way to store equipment and materials. To maximize the space, I needed to hang things on the inside walls.
That was easier said than done, considering that the walls are steel. And I did not want to put screws or any other kind of fastener or any holes through that steel wall.
The idea that emerged was to frame the inside with a few two by four studs that would provide the support for hooks and other things I may want to attach to the walls. And it turns out that a two by four fits rather nicely into the ribbed indentions of the container walls.
To hold the stud in place, I screwed a small block at the bottom into the wood floor. I used another stud across the ceiling and attached it to the two by fours in the walls with an angle iron. This horizontal piece is basically a blocking at the top that secures the framing firmly into place. Certainly firmly enough to hold my ladders.