This website helped me choose a keyboard to build. You can stack keyboard layouts on top of each other, or print a layout to get a sense of how comfortable it is to use.
Which did you choose?
I went with a Killer Whale, which is missing from the page but very similar to an Iris. It was tedious to build but having mouse control in my keyboard is very cool.
Awesome, thanks! I'm on a similar journey and love the feedback from others who've gone through the process, much appreciated.