I'll just leave this here:
http://youtu.be/X0yxShc8ZQ8
On a more serious note, we just drew the field from scratch for convenience. Then we bought a big piece of whiteboard from Home Depot and laser etched the design on. I really liked how it turned out, but one of our strategy mentors complained it was way too big - it was significantly larger than a normal clipboard.
Here's the file we used to laser etch:
https://drive.google.com/file/d/0B3e...ew?usp=sharing