I had trouble reconciling Mannequin’s original specialty with his current one too, but there’s a way to frame it that makes sense. He was first building huge self-contained biospheres to support life in inhospitable places. The only thing that’s changed since his heel face turn is the scale. It’s all still self-contained biospheres: they’re just smaller. He is working a *somewhat* outside his bailiwick, though. All the magnets and chains are out of scope. That’s why they operate a bit awkwardly.
I suppose that makes sense. He’s supporting life on a smaller scale than the entity he’s supporting life for.