What materials are you using for the build?
1) Acrylic (expensive)
2) Glass
3) Plywood
4) Some combination
I built and plumbed a 260 gallon tank, but just couldn't run the risk of something going wrong. I wish you the best of luck and would love to see the pics. along the way.
Check out, if you haven't already done so, "uarujoey" on youtube.