I got an itch for making another Doom level... so I made another Doom level. The editors sure have progressed since the 90's! Most the old limitations are gone too, so its all you can do to keep the geometry from spilling everywhere. Download the beta package if you're interested in testing and giving feedback, or just want a quick punishing blast from the golden gameplay past.
UPDATE: The map's done, and thus out of beta. Added a betatest highlights gallery to this post.