Your questions are not possible to answer.
What size is a "full sheet"?
How much is a ton of money?
What sort of precision are you aiming at?
How much space do you have?
Do you want to buy everything locally (USA) or are you open for eBay as well?
I don't know that book, but if I'd buy it I'd read it and start from there.
You must be more specific. Every CNC can cut MDF and plywood, some better than others. I have built a CNC but not mainly for MDF and size was not on the top of my list but rigidity, accuracy, repeatability and suitable speed (for the size of table). I don't think you'd like my build for your purpose (guessing from your words) but have a look at the specs I have and look around on my blog to see if you find something interesting.
https://adapting-camera.blogspot.se/...nt-status.html