It has been a long time since I removed the large and epic stone walls but, basically, this is what I did:
Code:
large_stone_wall requires factions { }
{
capability
{
wall_level 3
tower_level 1
gate_defences 2
gate_strength 2
}
construction 5
cost 3200
settlement_min large_city
upgrades
{
epic_stone_wall
}
}
epic_stone_wall requires factions { }
{
capability
{
wall_level 4
tower_level 2
gate_defences 2
gate_strength 2
}
construction 6
cost 6400
settlement_min huge_city
upgrades
{
}
}
}
plugins
{
}
}
As you can see, if I remember correctly, I kept the buildings in the game but removed the ability to build them to all the factions.