Sorry I haven't given any updates recently. A combination of waiting for parts and just taking a break lead to not much progress. Today however I made it to the shop and finished the machining on my small 12V compressor. Everything fits perfect and it's a solid setup.
I don't expect to get very much boost out of it at all. In fact if I can maintain positive pressure at redline I'll be happy. I'm using a sensored motor to help prevent cogging issues I've had with previous setups, and it should provide much smoother operation.
Next step will be lots of bench testing and building a control system.