An automated service station could be quite compact; it wouldn't need plumbing, lighting, human-comfortable climate control. Parts can be modular, and when a station gets low on spare parts, a self-driving truck could come by to pick up damaged parts and drop off replacements.

We're not there yet, but I think we're a lot closer than most people realize.

This is kinda terrifying from an AI apocalypse angle, though.

It almost feels like "A robot shall not autonomously build or repair another robot" should have been another of Asimov's laws.

Just need a third one for when the second one breaks while servicing the broken first robot.