I haven't played around the Delta in many a year, but I seem to recall a lot of rich guy type houses with private docks. I wonder if you could locate a vacant "weekend getaway" type of house, and work out a deal to be a liveaboard your own boat housesitter at one of them? The home owner would get a measure of security, you would get a place to park/live. Maybe check with a realestate agent or something???