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Thanks Steve for the info. I've been trying to read up on these and there's some info that's hard to find in the gap between the "slap a combustion chamber on a turbocharger" crowd and the "build a real one" crowd. Your build looks amazing and has awesome fit and finish.

What are you doing for bearings, lube, and cooling? I see three notches at the front of the shaft tunnel and you've got one lube line coming in. Are the others for bleed air cooling? Where does the oil return?

Just to add if you are stuck cutting 304 the trick is to cut with lots of feed and not too fast (I don't know the numbers but it's opposite what you do with Al). The surface layer work hardens so if you don't cut deep enough you'll just chew through your cutter.

If you're still wondering how to do the perfect hexagon from a random plate: Draw a circle the size of the point-to-point dimension you're aiming for using a compass. Draw one diameter of this circle. Using the compass (still set to the circle's radius) place one end where the diameter crosses...

I know this is reviving an old thread, but one easy indicator of PTFE over HDPE or PP is that PTFE sinks quickly in water, the others don't (just look at the density).