Improved https://www.thingiverse.com/thing:6058962
Larger factory than before and now with two different interiors. One is just a rubble floor that you can drop whatever machinery (tanks, tractors, boilers) you want onto it. The other is supposed to be a sugar factory.

For those of you lucky enough to NOT have an unhealthy obsession with building a sugar factory, I believe an explanation is in order. I have recently got into war gaming WW1. During that time period, and to this day as a matter of fact, sugar beets were a major crop in France. During WW1, there were many towns with factories that took sugar beets and converted them into sugar. And there were several battles that were fought with a sugar factory nearby. The battles at Berry-Au-Bac, Courcelette, Serre, and Souchez for example. When I built this sugar factory, I wanted to represent the major parts of the sugar refining process. To begin the process, the beets must be washed in the Wash Pit to remove the dirt and stones. Then the beets are shredded and put in a large tank to extract the juice. The juice was then pumped into different vats and tanks to refine the juice, and eventually dry it. At some point, lime is added (the chemical, not the fruit). It appears that enough lime was used that many of the factories produced their own by heating limestone and/or chalk in their Lime Kiln. The Boiler Room generated the steam necessary for the Engine Room to power all the machinery through a system of chains and belts. The models are not exact historical reproductions, but I believe the stls are decent representations. So there you have it.