Well, I got around to building another ophion coil. Here is a pic of my first attempt making one if Nach's coils:
I am not sure how Nach built his coil, but I have found it easier to wrap some 26g around a small gauge pin (measuring 0.035" in diameter). I am essentially making it like a microcoil and then stretching it out to separate the coils. It is a very simple process. You just have to make sure that you stretch it out to the right length so that it fits properly around the periphery without touching the edges. The one pictured below is essentially the same as what I currently have installed except that it has significantly more wraps. That one did not heat up quickly enough so My current coil has 7 wraps. Having less coils means that I have to stretch it out further, which is actually beneficial because it flattens out the coil in the process.
The main key for performance, in my opinion, is in the wick. Nach recommended that I try organic cotton balls and that it should be packed in fairly tightly (as opposed to the traditional concept of cotton...less is more). I got decent results with that, but I wasn't fully happy so I tried my standard organic cotton wick, loosely packed...and the results were (and still are) tremendous! I am sure that I will get similar results loosely packed with cotton balls.
If you guys are having a hard time replicating Nach's coil, just try making a microcoil and stretching it out.