I have a 20g long under my 46g bowfront, and it fits quite nicely. Of course, I made my own stand, and it goes out another 3 1/2" on either side, so that gives me a little room. Not to mention the fact that I made it rectangular instead of following the natural contour of the tank. I don't know if you can buy a bowfront stand like this, but this is what I'm talking about:
Not counting the trim, the stand is 22" deep, 41" wide and 35" tall. As for the tank measurements, I got pretty much the same as Nyxe: 12.5" & 16.5". That's from outer edge to outer edge. I'm afraid I don't know the manufacturer of the tank.
At least part of my tank is tempered. It's probably just the bottom, but to be safe I went with a HOB overflow. Bowfronts can be a little tricky to drill, but many people have done it, so it's certainly a possibility.
I'm pretty happy with the tank. I really like the overall look, but there are at least a couple major drawbacks. First, cleaning the front glass is a bit more difficult. There's really no getting around getting your hands wet from time to time to manually scrape the glass, so you can go horizontally instead of vertically. Second is the distortion. Visually, it's not particularly noticeable, except perhaps at the very edges. If you like taking pictures of your corals, though, it's sometimes a challenge, especially towards the edges of the tank, where you'll almost always get some distortion.