I can recommend doing this to make a house for your own family but I think you have to be a bit insane to front your own money to build houses in almost anywhere in California as a business proposition unless you have a contracting license, which is to say, you already were able to make a decent living. I only got away with doing it for my family because all the people who could have brought the insane rules down upon me were kind enough to realize it was just a family trying to survive, they'd have fucked me with all sorts of inspections, shenanigans with the utility company, having trouble getting water, trades licensing, engineering stamps and plans, etc if they'd have gotten a sniff I had done this "again and again."
This kind of stuff did work fairly well up until in the 60s/70s before developers got in bed with the regulators/planning and zoning boards. Back then a guy and his truck could become a developer easily.
I don't hate the idea but it's not a bootstrapping plan. It's a plan for someone already bootstrapped.