Oh, I didn't buy based on the factory consideration. I knew they were planning the factory but even when I bought they weren't sure if the factory was going to be up and running in time for our home.

Only homes of certain sizes and dimensions are built indoors. As mentioned, probably up to around 3000 sq.ft, but of approximately square footprint. Some models destined for corner lots are more rectangular, even though not more than 2400 sq.ft, and are being stick-built on site. All townhomes and semi-detached are also stick-built.

I believe the exterior of the homes is bolted directly to the blue I-beams you see in the various photos (take a look at the gallery in the article I linked as well). When inside the factory they can roll them down tracks that run the length of the facility. If you look at gallery image #4 you can see that under the I-beams there's another set of beams that will move with the house along the tracks. When they get to the end they probably use hydraulic jacks to lift the whole thing up. Then drive the dolly and new beams underneath it before lowering the jacks again and freeing the second set of blue I-beams. Now the house is on top of the dolly and out of the factory she rolls.

In fact they sometimes drop 2 or 3 houses outside the factory door so they can then roll them to their foundations in a row, one each day. Sometimes they have to make concessions and cancellations for weather which can lead to 2 or 3 sitting outside next to each other. Mine was pushed out a day because they had to push out the one before it due to very high winds on its original delivery date.

The home is also Energy-Star certified which was a minor selling point for us.

I'll hopefully have a chance to check it out closely and in person around the 24th. If I'll post a few pictures if I get anything worthwhile (time to test out the 18mm on my new 18-200 lens )