The wards were not housed in the castle they were only processed there when they arrived. The wards stayed in several small houses around the castle. The castle had offices, a school, kitchen, showers and the only hospital in Ione at the time.
The image below is the chemical bath they used to delouse the wards when they arrived.
In the image below the raised indentation to the lower right was for the gaurd (to stand in and keep his feet dry) to keep and eye on the wards while they showered.
The image below shows a hidden staircase they are not sure what it was used for, but some people think it was used so dean could use to get around undetected.
The castle had a water powered elevator shown in the next two images.
A fire hose reel, the part with all the holes is made of wood. There are several of these in the castle.
They are not sure if Merle Haggard carved the "Merle 48" in the wall or if it was done for a film that was filmed here. He has been asked to come back to visit, but he says that is not a part of his life he wants to revisit.
When Preston Castle closed the state came and took items because the castle was going to be torn down. Luckly it is still standing today. There is an effort to restore the castle and you can find out more by going to prestoncastle.com. If you would Like more information on Preston Castle visit Dreaming Casually.