Vulcan43/Wall-Mounted-Workbench-Computer — reverse-engineered prompt

I want you to turn this into a clean, easy to follow DIY project for a wall mounted Raspberry Pi workbench computer. The idea is a monitor on a moving wall arm with the Pi mounted so it saves desk space, stays easy to upgrade, and can be used for different kinds of making like soldering with a microscope or pulling the screen down for 3D work. It should feel practical, budget friendly, and stay under about $300 if possible.

Please organize whatever is already in the repo, especially the CAD and camera related stuff, and make the project understandable for a normal maker. I want a much better README with a simple explanation of what it is, why someone would want it, the main parts they need, how to assemble it, how it can connect to one or two screens, and how it can be removed and taken somewhere else if needed. If anything is missing, fill in sensible gaps and look up current Raspberry Pi details online if you need to.