Instead of buying plans, just make a plan:
-read the build logs
-learn Sketchup/free/ to draw your machine/ very simple to learn and extremely fast to draw using 5-6 buttons and mouse/
-make a build thread

One thing to say. Ok , i have to say it because its true- This is the best forum in internet for CNC. The knowledgeable and friendly people make it so. But mostly, you will see here far better designs than the typical "plans for sale", even than most of the commercial routers.