Hello everyone

Well, here is what I finally came up with. I took Mason Jars Idea,
You might consider another track in behind the open loading dock. You might use a curved switch just "north" of the RH turnout shown in your diagram. This has the makings of a major industry...!
Andrew
And added extra tracks.
Then I took Russ'es idea and ran with it,
I had not thought of it when I first this thread a few days ago, but when the company I worked for was located in downtown Los Angeles before the move out to City Of Industry in the early 1990's, there was a tank manufacturing company right behind our back fence. If I remember correctly they made both pressurized tanks for propane or compressed air as well as unpressurized tanks to hold fuels or oils. A model of that plant would fit your footprint nicely. It had two tracks coming in right next to each other. In front of the office on Alameda Street, they had finished tanks displayed for sale. They had an enclosed office building with an open sided shed covering the the 2 tracks and an outdoor work area and an overhead crane like the Walthers model on the following page:
Walthers Model Railroad Mall -- product information page for 933-3102.
It would need to be reduced in size to fit the prototype which was a smaller crane operated by an operator on the ground working a switch box on a cable.
The office building was just a simple stucco building.
I don't have a Walther's catalog, and can't seem to find what I'm looking for on their web page, but the open shop would be like a Pike Stuff building supported by steel steel arches and beams, but no sides.
This company received 3 mill gons loaded with steel plate and various structural shapes about 2 or 3 times a month. They would send 1 gon back when they were unloaded, and keep the other 2 for loading scap steel as they built the tanks. They would generally have 2 gons loaded with scrap steel and ready to be hauled out when they were ready for more steel to build tanks with.
So, the first two tracks will be manufacturing ( widgets) where steel in gondola's will come in. After that the widgets would be palatized and forked to the loading dock on the third track to be loaded into box cars. The forth track will be propane tank(s) for the manufacturing process.
So, what do y'all think?
Loren