I just thought, if you have a natural enemy of wooden structures which is fire, why not include rust in Rust?
• Make Sheet metal bases decay if you splash water on them (new mechanic soon) or they encounter rain. Rusting would work differently then decay. Lets say it takes 20 hp per day. • Same thing would apply to weapons that you swim with. • Include heat into the structure mechanics. The flamethrower was just implemented according to rust twitter, so lets say you heat up a metal wall with a flamethrower, and as you know, metal gets much weaker once it heats up, it could drastically reduce its stability hence taking more damage from attacks.
Maybe am retarded. You tell me.