Bleating Heart Cheese in Tomales, CA is run out of a shipping container. There are a few creameries in the area that are in shipping containers actually. It can be done, but they are difficult to climate control, and you may find yourself outgrowing the space rather quickly. There's a lot of conversion that has to happen and sometimes it winds up being cheaper to actually lay foundation and pour slab than to retrofit a container.
The challenges in Shenandoah are going to be drains freezing in the winter, keeping the space heated in the winter and cooled in the summer. Here in Northern CA, the temperature is very consistent between 40 and 70.
There is currently a creamery in a container for sale in Mendocino, CA. Contact Elk Dairy if you're interested.