Thanks for that Karl. I am thinking of a backward step from what you have done.
In my shed I have two mills and a lathe that get used ocasionaly and need coolent even more ocasionaly.
So managing flood coolant is a pain.
What I would like to do is make one small unit like yours using a smalll gas bottle
and moving it to a machine when needed.
So simple, read cheap would be good. One regulator.
I know this is disregarding your improvements but I think it would be quite adequate for my needs.
So do you have info on your first attempt?