if i were to make only one request for this game, it would be to have some kind of expanded copy and paste function, something that would allow me to quickly clone basic assembly lines, (i.e. copy and pasting a full array of smelters with loaders and belts, when establishing a new mining site).
i think the ideal implementation would be to just have a volumetric selection function like what the remove tool uses, and then save those selections to the modular building planner, and have the construction ships assemble them when theyre placed in the world.