[tytso]

It might be worth taking a look at Bensonwood (https://bensonwood.com). They do some very impressive, high-end pre-fab homes, and they solve the "must fit in highway lanes" by shipping walls that have windows, electrical wiring, plumbing, etc., all already pre-installed in their factory in New Hampshire. When we investigated using them 3 years ago, they didn't support pre-installed CAT 5 wiring or Optical Fiber, but I wouldn't be surprised if they can do that now. :-)

This is all done using computer-controlled manufacturing equipment, much of which is imported from Europe, where they are much more advanced on this front than in the U.S. One of the advantages of having computer controlled nail guns and vaccuum operated "wall flippers" is that the construction tolerances are far tighter than if you have humans nailing in the shingles, sometimes while on a ladder 15 feet above the ground.

The downside, of course, is that they only today have their one factory in New Hampshire, and while the walls can be shipped trucks on highways, if you want to build a large, luxury pre-fab home in Arizona, the trucks have to travel a long way, and that adds to the cost. This hasn't stopped some of their customers, though. Take a look at their web site for some example houses that they have built --- it's a far cry from what most people think of when they hear about "pre-manufactured houses". These are not trailer park homes!