Hello, and welcome Piet.
What voltage do you intend to get from the generator? How far apart will the magnets be? You are using very small magnets and very few coil winds, which means you will need to get a high RPM to get a reasonable voltage.Normally that means shorter blades, otherwise the tip speed gets too high. I think you will struggle to get 12V from the configuration you have described. You could combine 2 or even 4 of those magnets together to make a stronger magnet at each position.
My unit has been reliable even in the high winds here. Its obviously important to mount it very securely, and make sure the blades are very strong. It can be surprising the amount of force, especially at the end of a long pole, so I would suggest making everything thicker and stronger than you think necessary at first!
The ideal is probably a combination of wind and solar. If the wind is not blowing, there is nothing the wind turbine can do!
Looking forward to hearing how it goes!