Playable on: MAP14
This is a Romero styled map, featuring a nonlinear layout, lotsa vertical stuff and some surprises. Drains inspiration from Romero's maps.
UPDATE: Ok, I've shifted the textures a bit and the map itself, I haven't touched the geometry (I think the blue key area is less map11-ish now). I think it works better now with the city sky, thus it is map14... It's slot is optional.
Having played Romero's maps one more time I tried mimicking his texture style. If it seems too much alike any of his maps, I must say in defense that it seems to me he favored several textures from the stock set, whilst straining away from others. For instance, he nearly never uses Bricks or SP_HOT, whilst all of his Doom2 maps have wood, zimmer, stone5/6 and most importantly metal - each map (possibly except Living End) has a metal-only section.
Tell me how you see it now. And screenies updated.