You can conduct your own horrible experiments within the limitations of Fallout 4's latest DLC, Vault-Tec Workshop, right now, because it's out. Yay, time.
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In another dose of settlement building, Vault-Tec Workshop allows you to build your own vault and then torture its residents, just in case having them battling to the death in area fights wasn't enough.
There's a bunch of new decor in there, too, so you can spruce up your existing settlements with prewar furniture, lighting and art.
Initial impressions on Steam aren't looking good, though most of them seem just angry that this isn't a story expansion. Maybe you're better off with this, though:
The DLC is available for $4.99 on its own, and is included with Fallout 4’s season pass. "Vault-Tec Workshop" is the fifth add-on for Fallout 4.