Fence Kits, Watchtower Kits & Flag Pole Kits should be able to conform to the land, whether that's having a kit go slightly on an angle when one side is on a kerb and the other is on the ground, or whether the kit is placed on a hill, slope, slight incline etc, it should conform to that and put the kit at an angle. This alone would greatly increase the love or lust to build a base.
Also adding more to building, like half fence kits, length and width variants, bigger gates, larger watchtowers, external wall kits etc.
And please, give us some sort of digital code lock.