Welcome to AQ, Hec!
There used to be a forum member called Cacatuoides here who does custom tanks, I've seen his old posts around. He used to be linked to Aquatic Dreams (
http://www.aquaticdreams.com.sg/), IIRC. I've never used their services and this isn't an endorsement - just throwing out an option for you.
Also, a friend's father-in-law works in stainless steel or something - his arowana tank has a dedicated tap (regular municipal tapwater - his arowana apparently has no problem with that!), and drain as well. I'm sure he can link you up with whoever built his plumbing. You can PM me if you want to get in touch.
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