A good start to a map and I can see lots of potential.
My big complaint is the texturing, which I really dislike. I find the main texture, the grate thing, to not fit in well with all the places it is used and I recommend switching it to something else. Also, the color scheme consists of only brown and black, making the map unattractive overall. I would try using textures with more contrast, even for something like a metal city, or using different lighting colors.
Appart from that, if the bugs are fixed and the other poster's comments are considered, then this could be a good looking and fun map. I like some of the concept that are displayed and I would enjoy to see this map completed.