Plaster City and US Gypsum

There are so many buildings, tanks and manufacturing units, I have no idea how I can model these? In the plan from Tom, that David refined, I have a three track arrangement coming into the plant from the mainline. I would love to have the center beams loading and shipping and the incoming covered hoppers and ACF Center Flows.

Think I'm just gonna jump in and go through my structures and she what I can do to kit bash and mash this all together.