Looks like a faithful reproduction of that room from t3_rift. Good job on that. But why not embellish it with a little of your own stuff? For instance, the huge, perfectly cylindrical pillars...maybe make them segmented, or add little vertical trim pieces going up them? I never really liked those perfectly straight pillars in Raven's level.
The idea of diversionary maps (or sections of maps) that give you extra usable goodies is a good one. Kinda like WC3's side quests, eh? I guess you can do that to some extent with secret areas in a single map, are you thinking of that or completely diversionary maps?