We toured their factory they set up at Mare Island. The 'pre-fab' thing is interesting. They design them so that their components unfold, and they can be shipped by truck. The primary use case seems to be places where there are short building seasons (cabins in the mountains for example) and where on-site work is cost prohibitive. A friend of ours bought one and put it up on land near Johnsville in the Sierras. It neither feels nor looks like a 'mobile home' or 'prefab' home, but of course it was prefabricated. It took less than a week to go from prepped foundation to cosy house. That was pretty neat.