Button Layout Customizer

So I've been laser cutting various parts for people and something that keeps coming up is how difficult communicating button layouts through text is. I put together a web based button layout customizer to help the process. I thought I could further generalize the code into a standalone button layout tool to help all of us arcade builders. Would you mind giving any feedback or constructive criticism? There's still a lot of work but I find myself already spending hours trying different color schemes Image may be NSFW.
Clik here to view. Hope you find it fun to use too!

Image may be NSFW.
Clik here to view.

http://www.cuddleburrito.com/gamething-customizer-1
(I've tested on Chrome, Firefox, and Safari)