Anything you put up downrange that is not bullet-proof will get shot to pieces by range users.
Anything made of unshrouded steel will get shot down by the CFO.
You can make up range rules and yell at people until you are blue in the face and have a heart condition, but it is easier to just build the environment in a way that will help shape behavior, and also understand that some range supplies such as targetry are consumables.
Make things out of the cheapest wood possible and expect to replace them regularly. The plastic used for election signs is a better backer than plywood or particle board, because when new it has a tendency to seal itself around bullet holes, rather than splinter apart.
ABS or PVC pipes buried vertically in the ground are excellent for sticking target frames into, as they can't get shot up, but many ranges have erosion problems on the berm and these can get filled up with backstop dirt and disappear on you. Railway tie bases are usually the best way to go on these ranges, but these too will need to be replaced eventually as they get shot up when people inevitably place reactive targets on them.