From a painting perspective, Calvin Tan put together a decent tutorial on his blog on painting ACUs (the US Army's digital camo). While CADPAT is different, I think the principles may apply. Here is the URL:
zyclyon.blogspot.com/.../representing-acu-in-135.html
Unfortunately, many of the images appear broken right now. I'm not sure if this is temporary for permanent (which would be a shame). But here is a link to Alpine's site which shows the result:
www.alpineminiatures.com/.../paintingguide.html
I hope this helps. Good luck and I'd love to see what you produce.