Wow, you really put some work into it. Looks great. I like the colors. I'm guessing you cut out all those parts with a router. I doubt I could do anything as clean by hand.
Don't question your sanity, it'll be all worth in the end. Besides, how will you build your second cnc machine without the help of your first? Haha... But by the looks of the one you are building, I'm guessing you will get plenty of use out of it before you build another one. Nice job.
Oh a quick Q, is that PVC pipe in the middle of the rails? If so, why didn't you go with a metal pipe?