A tri-level warehouse level with Quake 2 textures and a wide assortment of weapons. Lots of exits out of each area and no dead ends! Very detailed and smooth flowing.
I updated it as of this post with two more plasma, 1 more phoenix, 1 more set of quads/super lasers and 1 pack of homing missiles hidden with the cloak. The level simply doesn't feel like a shaker level to me. So I'm leaving it as is without one. Now Azure catacombs (my up and coming final level) , on the other hand, feels more open and more apt to have shakers.