I think the biggest drawback for pre-fab housing in the negative image that it is somehow lower quality construction. Some people even confuse it with mobile homes. I watched a season of This Old House recently were setup a pre-fab house for a family. It was very interesting. They brought in the house in section that were wired, plumbed and had future proofing setup. The house took a couple of month to put together, partly because of the weather and TV show been filmed around it but it went up quicker then most homes these days. The house was very nice. It looked like a $600,000 home in my part of the world.