Not actually a server rack but three laptops on a bookcase.
This was a small project right at the start of Covid19, where I needed two Universal Robots UR3e robot arms and a control PC (plus my normal office setup not fully shown on the right). Given that it was early lockdown there was no way I was getting access to the lab. I did, however, have two old Dell Latitude laptops that could perfectly run the UR emulator. Each would act as a robot over the network plus a control laptop running ROS.
Sometimes you are forced to get creative (bonus points that it actually worked).
