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Ruby Rose once again showed you the plans she'd made and the rooms she had suggested you to build:
Factory rooms were just what they sounded like. While they could be made to mass produce certain items, you were more partial to having them assemble clankers. This would need your personal touch; clank-creation was Savant tech and couldn't be replicated by non-Savants.
Engine rooms would be used as a place to create energy and store energy into batteries. Said energy would come from steam power—needing coal/charcoal and water in order to function and wielding pipes that would send both smoke and steam far above the mansion's roof. Ruby herself admitted that this room wasn't particularly useful now, but it would help in powering stronger things in the future.
You personally wanted to test the nature of generating electricity in this world—if it would be as efficient as steam power—something that Rose was equally curious about (especially when you told her it didn't require Lunacy Savantae to make).
Boiler rooms were initially created as an area to create mix materials and potentially create cheap potions in mass. However, with some additional tinkering, you could easily change their use to something that would benefit your aluminum-making scheme.
You and Herta had quietly been making progress in the process to refine aluminum, with a surprisingly high margin of success.
And last, but not least, the was the "Control Room" Ruby Rose prided herself so much in. It had a small speaker system, allowing her to make announcements through the mansion if needed. She put emphasis on how this room would, in her words: "Increase the efficiency and productivity the estate would have, while merely taking up one of the smaller dungeon rooms~"
If you were feeling mean you could call this 'lair' a vanity project of hers, yet you could tell that she was passionate about it. With future plans to weave her "Spider's Web" in here, it might not be half-bad as a hidden base of operations for any future spy network under you. Or maybe that was just Ruby trying to convince you to let her have this.
And there you had it, the three main 'types' Ruby suggested: Factory, Engine, and Boiler.
"I couldn't help but grant each design type a certain area: Each according to how useful they will be." Ruby said. "Of course, that's not to mention any further designs you wish to suggest, and any changes you wish to make to my suggestions, design-wise or how they're distributed." She presented to you some empty blueprints.