you do NOT need the propulsion gun. Got everything from the aurora with only fire extinguishers, welder and laser cutter. edit: i know what room you are thinking of with the prop gun....found it by swimming through the inside.
I've tried two new survival games and both times the cyclops disappeared. Normal progression, only one built each game. I tried to debug spawn a new one and got the error "Could not find prefab for TechType = Cyclops" edit: figured out how to spawn …