If you want to build a structure that meets the building code, just go to your building and safety department and ask for the form. That form has all the information you will need to build an earthquake-resistant structure that is properly insulated, etc. I am in a tract home and don't have enough property to make a shop like I would want. I'd need at least 4000 square feet for it, and the house is 2100 square feet on about 6100 square feet. My "shop" is a portion of a 2-car garage that no cars can even be parked in. I was promised a shop when we moved to this house 17 years ago. I should have done more research, but I was too busy working overtime, making the money that my wife wanted to use on this house for that. My bad.
