Photos: How To Build An Atlantic Yards Skyscraper In A Brooklyn Warehouse - Photo Gallery

These modular frames are built down south and shipped up to the factory on flatbed trucks. They wait outside until they're ready to be outfitted inside. The metal frame actually forms the support skeleton of the building when all the pieces go together.

The first step in the assembly line: adding the interior framing for walls and sheetrock.

You can see the interior stairs for the building in this module.

Heavy parts are brought in using a crane. Having the modules on the floor means that jobs usually done high in the air on a regular building site can be done easier and with less risk of injury.

The metal frames for walls are made at this station, then sent across the factory floor to be installed in modules.

The factory is pretty warm inside: beats working outdoors on a construction site in winter.

One of the triangular corner modules that will face Flatbush Avenue. There are a couple of dozen different shapes of module- they go together in groups to form a single apartment.

Fitting out the inside of another module. These workers are assigned to a cross-functional team that does a bunch of tasks, including drywall, pipes, windows, etc.

Parts are stored nearby for when they're needed. It's easier to get them where they need to go than on a vertical skyscraper site.

These workers are unionized construction workers fitting out the bathroom boxes, which are installed as one piece in the other modules, complete with tub, sink, and shower rods.

These modules are almost ready for shipping to the job site at Atlantic Yards; you can see the shiny black exterior panels which will form part of the wall of the skyscraper.

The warehouse is huge. More than a hundred construction workers are moving around inside.

The breakroom for lunch, a step up from eating on the sidewalk.