Thanks SServis. Really good link. I totally agree that the extra FOV is fantastic, and definitely preferable for regular combat etc. As you caught: I highly simplified the math, and my thought was more whether you end up with "wasted" space dependent on camera zoom etc, and also whether the alt windows become too small to be useful.

However, I was definitely over-thinking the problem! My Acer arrived and it's 3840 x 1600, so doing the standard layout has given me a main window of 3840x1300 (~26.5:9) (ie fantastic FOV) and the alt windows are large enough to be meaningful too. Now it's just the fun challenge of rearranging all the UI components to be most useful.

It'll be really hard to go back to a 16:9 monitor now. Gaming is a whole new world.