Cobra, I did spend a fair amount of time actually putting those damned floor guides down, so the least you could have done was recognize the pattern that I was trying to establish. There are areas where it's totally lost (around the hangers in particular), but that's not where any of the problems in your last update were. Anyone doing a multistory piece in the future, please lay it out across multiple decks in the upper empty area first so that it will fit properly when it's inserted in its final location. Still post it by itself for bandwidth constraints, but at least make sure it fits right before you post it. Respect the ducts
The black lines on the floor are the one directly below the carpet/floor of a module, but the upper black line is the actual start of the ductworks. It breaks the 50 pixel height, but we've not held to that since like the second update. All future decks will conform to the established pattern.