I'd be a huge project though, like 250.000-500.000 stone needed and 500 day's of labour, making it a project fit only for metropoles and only if everyone coorperates.
To make it fair and to avoid the possibility that every trailerpark ingame is walled within a year, the resources could be colled outside too.
It'd be nice if the gates could be breached in the future. IMHO it wouldnt require some sort of neewly created siege engine, a project using regular weapons would doo, but taking quite some time, like a RL medeval siege.
It would definatly add to the game, and prevent massacres like in Cantr City where a blooming metropole has been "dastroyed" by 2 ppl.
Gives some cities something to do aswell.
