>Since the pipes are ready, set up the steam generatoro/storage area. Get the water flow pipe first, with a cutoff valve near the source, set up the water piping and pump, prepare the heat transfer loops, and the storage tanks, link the levers to the emergency valve and ssteam release, and make sure that nothing needs to be altered and everything is magma-proof.
Install a last-minute extreme-pressure-triggered valve that releases steam if it approaches critical pressures.
Have an emergency water inlet to the magma chamber, with a closed valve operated from the other side of a wall.
Build all pipes through the walls/roofs/floors that connect directly to the magma chamber, so that no work is left to be done inside.
After ensuring that everything works, and all the backups as well, and the main cutoff valve is closed, and the magma pit is properly surrounded except on one side where you have installed window(If haven't now is a good time) above magma level, and the magma inlet of course, open magma flow until chamber is flooded to operating level and then close magma flow.
Open water flow to the boiling coils.
Ensure everything is functioning.
If so, commence primary pipe path, including a few valved junctions for future expansion, and some cutoff valves for future emergencies.
Close all junction valves(so the steam only has a single path to flow along for now) and the last valve that should be in your workshop. Ensure there are no leaks. Turn on the steam flow.
Create a pipe hub in your workshop, all connections closed except one.
Connect the open port to the automatic drawers. Install a pressure regulator on this line that will keep the pressure to the drawers under the maximum they can handle.
Open workshop valve after ensuring all pipes are again leak free.
Enjoy never having to manually open/close your workshop's drawers ever again.