I've done this, here is what I did and why I won't do it again.
The reason I tried was to save money on a low grit EP sized stone, in my mind, I would end up with a life time supply of low grit stones EP sized cut from full sized stones which are available here at Lee Valley. (I'm in Canada so shipping isn't free and also, I just wanted to see if I could do it. I had no intention of selling them or anything.)
I used a wet tile saw on a Bester 700 grit stone. I did not soak the stone, not because I don't think it is a good idea, I just didn't think of doing that.
The actual cutting process was quite quick, messy but quick and relatively easy. There is waste but the result was 6 pieces and not all of those were the same size. I then did my best with a DMT plate to square them off, remove any scuff marks left by the blade.
When compared to the products Ken creates, they are just ugly blocks of stone that I ended up tossing away. My curosity was satisfied, I'm leaving it to the expert.
Kens precision cutting is like something out of a labratory, my products were like something a bunch of drunk rednecks hacked out of a rock with an axe, a dull axe.