Nice work OP, plus its green & green bikes rule.
A "Tazzie" wobble ring...
IMAG0335 by pten2106, on Flickr
It would be cool to say they are named after a mythical riding god from the badlands of North Staffs, but the reality is that Tazzie (from here) struck up a deal with Goldtec, going out of his way for his fellow sillytrackworld brethren. The chain does actually go tight/loose/tight/loose, but it's not really a problem. I'm a convert. They even out the power delivery, especially on a singlespeed. And they last really well too. There was talk of a Ti version but not sure if that got off the ground. Tazzie reckoned on going 1 or 2 teeth bigger than normal, so I went 33/18 on my ferris wheeler.