All good suggestions. If you are piping air, here are a few more ;
1. If your main air pipe is overhead, make your pipe taps off of the
top of the air line, in other words the tee points up and you elbow
down to the outlet.
2. Be sure to put a blow down valve at the end of the line.
3. If you put in drains or drip legs, place the valves where they are
easilly accessable.

Bob