I'm the one that made it so i'd be the nuts one.
I just used a fresh map, and there is a little NPC tenement like building to the right. It's still on easy mode. Of the easy mode NPCs i think it's still missing partygirl.
You can right click timers directly. I have the two top timers separate like that so i can stagger the dart shots. If two darts hit an enemy at the same time it only registers one hit, but if you have a little delay then both are counted. My version of the pit of doom doesn't have flame traps. They obliterate my framerate. Instead i have 24 super darts set up to be triggered in a wave from a rolling bolder. Your'e going to get hit by one when you activate it so keep that in mind.
The upper layer with all of the spikey ball and spear traps is covered with lava to prevent enemies from spawning there. I wanted them to spawn in the deadly area. Not on the traps themselves. At the ends of the hallways of death there are teleporters to send the weakest 3 enemy types back through the traps a second time. Sometimes it catches the tall goatmen and the pogo men to so that's handy. I'm aware the spear traps don't reach the ground or even the tall enemies. They're just there to ruin the helicopters' day. The crab spawners have spikey balls instead of lava so the enemies that can fly through solid walls will take damage too. They ignore lava just like solid walls.
The central spawn is also the center of the death contraption so you don't have to fiddle with beds at all. It is also one block thick to exploit the fact the the needles spell can shoot through thin walls. The top layer has staggered solid walls so you can shoot down, but have cover from the bullets arrows and pine needles (rockets and parachut presents will get you still). I built it in such a manner that it is really a good idea to all stay on the central platforms to maximize the number of enemies that spawn in the kill zone. Also being near each other like that makes it so the spectre mage armor can easily heal anyone. The top layer have the two crab spawners so you have a bit of health boost whilst fighting ice queens.
I feel like i'm forgetting something, but i'll tell you in game if i see it. I should be able to make it to the event tomorrow. I'll ask my friends if they can make it too.