Howstuffworks features a comprehensive article on prefab homes:
But what exactly is a prefab house? How are the pieces constructed and assembled? How much money does it take to get a house on a plot of land? And what kind of instructional manual comes with the ultimate model kit?
The article is chock-full of information, with subsections including:
Title: How Prefab Houses Work
Length: ~4,000 words
Author: Tiffany Connors
Date: December 1, 2007