Joule is well regarded. Dudley is based in Washington
state hauls north south, sometimes east west he is good too.
The only do it your self yards that I know of are Dricols in Mission Bay not Shelter Island, there is a boat yard in Oceanside that will allow you to work on your boat. You may have some luck with Knight and Carver in the south bay. None of them are cheap
especially compared to what you see on the east coast
and FL. You will need to have all the insurances and comply with the state of California's regulations