Wind turbines can be incredibly dangerous, I'd be worried if this was anywhere near my home. jacquesm wrote up his experiences making a wind turbine from scratch here: https://jacquesmattheij.com/how-to-build-a-windmill/
If there is an accident you'll have a giant wind spill to clean up.
But more seriously large chunks of spinning metal can turn into deadly flying knives when things break. With a properly engineered windmill this is extremely rare and usually requires a severe amount of neglect. With some DIY project built from scraps you probably shouldn't mount it anywhere near people.
