You seem to have it under control, and I'd probably be in for a set of these. But lock washers are crap! I find them really only effective with small fastener/low torque scenarios. If torque is pretty high for the diameter, then lock washers are simply unnecessary. Just go flat. NASA even has a paper that found that in many scenarios a lock washer actually sped up backing out once it started (due to insufficient load)Interesting idea. I like the lower profile head result. No post threading of the aluminum pieces required, so that's good. And no need for a lock washer when using a non-flanged hex head.
you sir make a very good point!