Nice looking tank there Nanoreef.
Why not get one of the old tank from Jamie's store for a sump.
When i had my 280 going I used a 45 gallon rubbermaid tub its easy to use and drill into, But if you start getting micro bubbles like i did it hard to get rid of. Give Dan out in Shilo a call he will make you a sump for a round 30 bucks if that. ANd if you are planning on getting a topp off thur a RO unit its easier again to drill thou plastic.
Pop over to my house and take a look at my 170 that i have going with the sump setup to get a few idea's are you going to put this inwall or on a stand in the house.
If you are making a canopy think about having the unit sitting on top of the canop y so your canopy don't heat up .
mike
give me a call im on xmas leave now just sorting out my lights today and the trim around the tank.
728-0342