we don't use the neutral side of the flags but we do allow people to build on our land. it much better to have people ask if they can build and then add their company ID to an area you deem fit on your land. if they require more space they can then ask and you work out what is needed. this way you have control and ensure that no one trolls your base as no one would have permissions to build near it. our island isn't the biggest but we have 4 smaller companies with allotments on our island.