Ignoramus13229 wrote:

My main question now is, is there "plumbing" for permanent air lines
comparable to electrical equipment. Like permanent air outlet boxes,
conduit (to enclose lines), that sort of stuff. My objective is to not
have it look like it is all jury rigged, be reliable and safe etc. I
have a kid who likes to hang around my workshop, so, I want air lines
to be as safe as electrical.

Just put in some quick release connectors, so that you can plug in the
air hose, where you need it. There is two styles of connectors, be sure
to get all the same, or you will be driven nuts with in-compatibilities.
For copper pipe, you'll just need some copper to threaded coupling
things, so the connectors can screw in.

With compressed air, going larger in size on the piping is good, since
it adds to the volume of the air tank. With metal pipes, you don't need
conduit or any other covering, except for decorative purposes.

Be sure to allow for drainage in the air pipes, don't create any areas
that can allow water to puddle inside the lines.