Well, I understand that you can't just make a single cubic solid for every piece that would be a block. The blocks are all one if there in a row rather one block next to another block. Also im not making these blocks destructible, I've noticed from the past that breakable blocks are only good for about 1000 or so. I've made minecraft maps before, but they were small. This one is very large, about a quarter of the grid from the top view. Since its a small town inside castle walls, its all open space and i know that i will probably have frame rate issues if i don't optimize properly. And yes hammer hates the map, closed out several times, out of memory errors and more.