Well this was way better than I expected.
Now I want more. So much more.
It took Doug Keener 100 hours to recreate Jerry Seinfeld's apartment in classic Doom. It's remarkably accurate (according to my own understanding of Jerry's apartment) and actually features Jerry, Elaine, George and Kramer — complete with perfect soundbytes, including death screams when one eventually gets bored exploring and feels the need to fire off a shotgun.
For some reason Jerry screams "NEWMAN" when he gets shot. I'm glad about that.
You can download it here.