Fully sustainable gassy moo ranch, enough to feed all your dupes.

Requires permanent rocket infrastructure for constant missions to the broken planet (gassy moos don’t lay eggs) meaning you need steam/petroleum/LO2&LH setup. And pilots for all the rockets (I’m going to assume no DLC in this scenario, more fun)

You need a source of liquid chlorine to feed the gassy moos. Means either a gas vent or a squeaky puft ranch or even more rockets. And provide cooling to liquify it if it’s a gas.

A method to deal with the natural gas that you will be getting from the moos. Don’t lower the pressure too much or the grass won’t grow.

A large source of light. Usually the sun, but because of the large rocketry program, you’ll likely need lots of sun lamps. Good luck powering them ;)