Here are the Add-on Packs:
Now the Wall Foundations are simply The Narrow Dungeon Tiles from the last Kickstarter. They will fit perfectly under the Battlements, since the Battlements use the same 2x2 system as the dungeon tiles. In fact you can mix in all the KS1 pieces with the Battlements.
I built a Castle Front Gate using KS1 tiles.
Hope this helps you visualize the AWESOME Power of the Battlements