Thank you all for the good advise!
Yes, this is the boat in the picture.
I have a lot of improvements to do... As far as an autopilot, I am investigating direct steering with a counter weighted blade, where the blade out of balance would have enough leverage to affect the tiller. As you can see, this boat is not easy to adapt to regular paddle in the water and a fin in the air design (Monitor). It sails pretty well up to 90 deg apparent wind without any help, and once you go beyond 90, pressure on the tiller decreases, so the paddle might work.
Yes, it would be a minimalist type adventure, but I like to simplify as much as I can.
Thanks again for any ideas