In my job I often have to visit data closets that are small and/or otherwise do not have anywhere to lay my laptop while I’m working. I made a lightweight portable shelf that I can hang on the back of a data closet’s door (or any other surface I can attach the hooks too). It’s also height adjustable : ) I still have to round off the corners of the shelf and soften the edges and get some different colour paracord so I can easily tell the front lines from the back but proof of concept it works!