I estimate roughly around 500 small housing units from what I've seen. The smallest units are about 60*30feet in size. For a slave labor camp, it would be easy

I estimate roughly around 500 small housing units from what I've seen. The smallest units are about 60*30feet in size. For a slave labor camp, it would be easy to fit 100 people in each unit with two story bunk beds. That's already 50,000 people. The units may be more crammed than I imagine, and I may have missed miscounted these housing units. 200K sounds like an upper limit but it's not impossible.