why do you want to go down the route of a building instead of buying a pre-built NAS?
Most pre-built NAS boxes are overpriced cheap rubbish.
For similar outlay in costs, + a bit of time, you can have a much more powerful, faster, more versatile, better performing server/nas unit which can use open software and be fully customisable, and more standard.
This exactly. I've had many pre-built boxes before they're no where near as good or as functional as building your own and installing a BSD based distro.you can have a much more powerful, faster, more versatile, better performing server/nas unit which can use open software and be fully customisable, and more standard.