Does the server have to run headless, or can one person still run games locally on it while another has a remote session? That is, would I be able to play on the monitor/mouse/keyboard directly attached, while my partner has a session on a laptop?

I didn’t before but now I am glad I did

requiring me to jiggle memory sticks or tighten CPU cooler screws

How much vibration is the computer subjected to? Do you live in a limestone quarry?