A thought on an out building. I used to live in Sacramento and had a large back yard. I used a two car garage kit from Home Depot. It was used for models and work out equipment, but I think if you built a wall with a weather tight seal between the wood shop and the model side that might work. Like your area, Sacramento has some hellish summer temps and can reach freezing temps in the winter. I installed an overhead with lighting and R30 insulation. The walls had R20 and covered with sheet rock. I covered the slab with peal and stick floor covering and replaced the garage door with a double wide door and a couple of windows. In the winter I used a small wood stove for heat, and the summers never seemed to make it to hot inside because of the insulation. Tuff Shed also offers some interesting buildings.