Just something to shake things up on your way down to the Cyberdemon. Between 5-10 wall segments with one door each are generated in fixed locations, dividing the level into as many as 8 rooms. If all the walls generate, the level looks like this:#########
#.#.#.#.#
#########
The rooms are loosely filled with stacks of crates, which are 1x1, 2x2, and 2x3 pillars.
With the crates here and there but so few doors, you'll have lots of cover and lots of mobility, but you won't have much control over the monsters. Ambushes would be common.