[uncensoredjrk]

If your friend would like to crank out multiple tiny homes, they should look for a company nearby that has automated Light Gauge Steel Framing machines. An example of a manufacturer of such machines is https://www.framecad.com/

Once your design is done, they can easily spit the parts out in an automated fashion, the parts form the wall and roofing panels. The panels are easily trucked to the site and erected.

[harmmonica]

Not sure if you have in-depth knowledge about this so I can avoid doing a deep dive on the linked site, but what's the cost of something like this? If you were going to do a 20x20 footprint, what would those 4 walls cost if you assume 3 penetrations for a window on each wall and a door on the 4th wall?

Totally get it if you say "go to the website" but if you're involved with one of these companies maybe you could answer that more readily than I can figure it out.