Here's a 3-zone hi hat I made using the same method with some slight improvements:
hi_hat_2.jpg
hi_hat_1.jpg
This time I didn't use any spacing material between the cymbals that are glued together, nor did I sand them. They were 14" but I cut them down to about 12" to keep things in proportion to the rest of the kit. Turns out that after cutting them they were ever so slightly warped - just enough to leave about a 1mm gap at the bell and edge. Perfect!
I also made the segments at the bell and edge a bit smaller (cut more of them) for more sensitivity, and made the bottom cymbal of the "sandwich" slightly smaller than the top one. This allowed me to wrap the vinyl over and under the outer edge for better looks and should help prevent dust or dirt from getting in the switch area as easily.
hi_hat_3.jpg
I also did a better job with the vinyl - it's very unforgiving. If there are any lumps or imperfections underneath it, they show up twice as visibly when you lay it down. Also (if you use this), a hair dryer is a must to get it to follow the shape of the cymbal and to prevent wrinkles.