Upon reading your comment I just booted quake3 in q3dm17 nightmare mode and immediately started having a blast. Was about to win the match but a bot took both the rail gun and the quad damage, it was a blood bath.
My favorite was rail brushing people off during pad jumps. Because they died from hitting the level box, they would get a -1. At work we had a match where every other player had a negative score. That aid, they were good sports about it and I didn't do it all the time.
I've seen Brandon James (KillMe) credited in multiple places.[1][2] James left iD mid-development of Quake 3, so the rest of the level design team likely also contributed after that point.[3]
I never liked this map and don't get its popularity. Same for the one in UT99 with the two towers on an asteroid. They're just too brainless and chaotic for my taste.