I build these and have one at my house.

Its been interesting.

Had some teenagers try to blow it up with fireworks.

Have to constantly remove proselytizing, mostly christian, pamphlets from it.

Had to buy a stamp https://littlefreelibrary.myshopify.com/products/self-inking... so drug addicts don't clear it out sell the books to buy smack.

Other than hat its been mostly self sustaining.