rules are a bit specific on how things work with Hangers, you can have a "Repair Hanger" and rotate damaged craft through it for repairs, but to count as hangered for maintenance each must have it's own bay space with rolls at -2 for Minimal, -1 for Limited, +/-0 for Standard, +1 for Extensive.
I have a 4,000 Cubic Meter module strapped to the side of an old mining barge to play with, for my craft at minimal I need 686 Cubes (unless your desperate you don't use this for anything but a docking bay or long term inactive storage), 1715 cubes for Limited (what most sensible people conciser the minimum for a proper hanger) and 3430 for Standard, there is no way I'd have the almost 7000 cubes I'd need for extensive on this ship.
Thankfully my Giant Robot is only a Resources Exploration rig, my token weapon is a Laser that is so token it's ineffective against last generation Military hardware and due to my poor gunnery is almost ineffective against first generation military and any generation of civilian hardware.
My character has only Token Tech skills and after working her 40 hours a week mining or standing watch wile underway and about an other 20 a week on ship board chores my character still have to find 120 hours a week to maintain the Mech. the maintenance Bots should give me 40-60 "Man" Hours and I may be able to bargain for an other 20 man hours out of the other characters, but that will cut in to my profits and still leave me with 40-60 man hours a week to make up. thankfully the client is paying for materials on this job.