iPod with custom shell, new screen, 512gb SSD, and a 30 day battery
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Does it play FLAC?
Rockbox does support FLAC, with iPodLinux I'm not so sure (their ancient http site FAQ promises development via MPD, but that's not a given to have actually happened).
or Opus
Just Doom and Crysis.
With rockbox installed, yes. With stock, ALAC.