Well, when I was going to build on 80 acres, I looked into all kinds of kit houses and log houses, and of all things decided to go with a manufactured house with changes made in the factory. I think a lot of prefab housing has gotten a lot of negative response because of their lack of good designers, but there are some really good points about it. First of all you control all costs at the decision making point, the inspections are done in the factory except for the final, and there are a lot of changes that can be made that are very reasonable because they are done in the factory, for instance adding sliding doors, changing windows, we added 2 x 6 contruction instead of 2 x 4, for only $1000 more! I am hearing that there are many new "green' pre-fabs on the market now, and I would take a look at some of these options if cost is important to you.!