I finished lacing the middle. WOW, very TEDIOUS. The mexican braid is a nice lace, but it takes a very long time and your hands will hurt after. There is a lot of pulling through. I would definately say to use larger holes instead of the slits. I had to open up all the holes every time I went through them with an awl. You have to go through the holes a couple times, and open them up both times. You get a rhythm after a bit, but it is still very slow going. I learned quickly that you can pinch the lace between your fingers and pull it through them to keep the lace from twisting up like crazy. The lace needs to be very long for this. I had to do one splice and the next time I made it a lot longer. On one side I ran out, only had one stitch left. I just used the other sides lace, as it was the last one.
So hindsight, use holes. I will post pictures later, going to get some sleep now.