BioShock Infinite's steam(balloon)punk world had a lot of impressive technology, but nothing that could actually play, well, BioShock Infinite.
That would have been both too meta, and too implausible. And yes, I know that world featured cyborgs and floating cities.
Reddit user CodyOdi has filled in the blanks with this casemod, turning a weird PC chassis into something Booker would walk up to, smash with the back of his hand and wait for food/ammo to fall out.
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My attempt at a steampunk PC. [Reddit]