kyhwana2: Whoever you end up going with, make sure you add an extra $20-30K fudge room for budget blowouts an make sure the architect builds in a small server closet (where the fibre/copper will come in, somewhere centralised with some airflow, etc) and they build in cat6 when they build it!

There's a cabling standard floating around somewhere..

How big would that sort of thing need to be. Or would it just be cubboard size / 600mm wide?

Even to stick a decent sized patch panel + UPS + routers/etc and maybe a server or rack if you're so inclined.