Handling maintenance and overhauls for GURPS Spaceships

[RogerBW]

I might be persuaded to allow an engineer who put in extra time, beyond the basic maintenance hours, and made some good rolls, to make gradual improvements to a ship's systems; either this would cost a lot in spare parts, or it would end up giving the ship a unique familiarity category such that any other tech working on her would take penalties. Maybe both.