I have been following the growing interest in prefab modern houses with growing interest. I have been turned off by the very high cost of prefab whenever I have looked into it. Most seem to finish out at over $200/ s.f. The standard double wide all vinyl modular homes come in at under $70. This is what most potential homeowners can afford on an average $50k income. So I was pleased to see a very thorough critique of the claims made by the prefab mod house industry. This From Jetson Green:

This article was written by Chad Ludeman, President of Philadelphia-based postgreen and developer of the much talked about 100k House .

link to the article here