ScottV and I are getting started on a 300g+ reef tank we're going to build ourselves! I've never built my own tank before, so it will be mostly ScottV leading the build... but I found the glass at a great price! (though, I did break one of the panels by accident when I dropped it :-( )
Anyway, for now, it's just some panels of 1/2in glass. The dimensions will be 48in x 48in x30in. We're going to send all the plumbing through the wall to a closet on the other side (where we'll have a nice 150g refugium). Lighting will be one 400W MH centered over the tank.
Here are some pics:
Um, this is where Scott spilled the hot sauce:

This is the "big piece":

Our Sweetie cat wondering where the fish are! :-)

I put up some tape to see where it's going to come out to and all:

Having too much time on my hands...