Criteria for a section are that he is a risk of harm to himself or others, not that he has committed such harm.

I also think you want to do some research on noise nuisance rather than simply accepting what you are told by indolent officials.

It looks very much as if you could get legal aid.

There have been some useful suggestions here, but you have ruled them all out.

With all due consideration maybe you should consider reframing your approach?