I know you're the king of flat ribbon, AMD, and it always looks like it works very well. I'll have to look more closely at the circuit diagram for building my own little welder that you and awsum have passed around. I don't know the first thing about any of that stuff, unfortunately.
Some people use ribbon without NR leads. This is my personal preference to use it. 0.6mm ribbon has the same resistance as 30 Gauge Kanthal, as for the area coverage, you be the Judge. It's like driving Hybrid vehicle vs. the muscle car: You get to where you are going just as quickly and comfortably but will consume less fuel.