That's why I considered making prototype Scubagens out of delrin and not aluminum, due to concerns about the health factor of AL and the ease of which delrin cuts compared to SS.
Yes it is hard to cut, and I do have a little chatter in my lathe Zen
I would much prefer to do it out of SS, since I will be using it after I am done
Well I did get part #3 done, just need to finish the top and do the electrical parts, dill holes for the wire point etc... Here is a pic:

Dan