Well yeah pricing out the glass is an issue. A lot of people, including me, enjoy constructing things just for the pride and ability to say "I made this" so that has some value added. I will weigh my options as I get closer down the line. A used tank would be a good choice too. The dimensions would have to follow what the glass shop can order in sheet glass. A standard 90 long is 48x18x24 Tall, so that would be my starting point. I'd prefer something slightly longer, say 52x19x20 Tall, but then I'd be looking at the throw of light from what ever light fixture I go with. I'd probably do a custom hanging canopy to fit the length either way. But do you know what I mean about the glass sheets, a front and side of the tank would lay up on a raw 6' by 3' sheet x2 and the bottom on a third sheet. This works if the length and width fit on a single sheet. Then you avoid having up buy a fourth piece of glass. The bottom could be slightly thicker thank the walls or all of it can be on the tick side if no braces. The thickness would have more to do with the surface area of the silicone bonds and less about the glass cracking. Still just a though, I was mostly wondering if anyone out there has had success with this.