I'd love to see some more gamification with the map. Those lapidaries could have x chance of being robbed of their stones (PvE, not PvP, they'd be burnt) which could be partially of completely mitigated by having a new building, the watchtower/guardhouse/barracks within a certain distance of the lapidary.
So if the lapidary is the centre plot here, the 10% chance of being robbed could be reduced by 5% for each guardhouse within those 24 closest plots, as long as the guardhouse is at least the same level as the lapidary.