Matt, I just re-read your description of the planned Syssa nose ring and now have a clearer picture. I'm sure Todd's will be functional and durable but it doesn't sound like something I'd try to replicate with my limited tools and metal fabrication knowledge, which is practically zero - as you know, I only recently found out what a Bernzomatic torch is!

With the ply nose ring, only a few degrees of the circle arc will have to be relieved for the sensor, which I don't think will compromise the ring's ability to do its job. I have some 1/32" maple ply and I plan to laminate 4 small sheets of it together to make a super-tough 1/8" 12-ply for the actual nose ring, and use some split smoke tube to line the inside of the ring.

Time to get to work on it. Well tomorrow anyway.