If you don't remember who it was, it may have been me. I remember playing an older version against you before, while it had a different name. There ended up being a lot of stuff on the map interlocked and merged. At one entrance to the middle, there is a little piece of bridge, coming out smoothly from the ground, then going to the bottom of an open single box, then another piece of bridge, then a wall on top of the ground. It allows you to walk through there smoothly, and looks kinda neat if you notice it.
This map looks sick. Oh, and it says Maxwell 360. I know him, he is on my friend's list. I didn't know he made maps.
He made parts of the wall, and the middle section, and helped me design part of it. He also has a couple maps of his own that he posted here, they're kinda old now though.
Amazing nice and tidy interlocking great map and good use of window panels normally you can't aim to far down if there the right way up.
Usually you can only get four stories high due to Foundry's invisible barrier. I put them on the side so I was able to squeeze in a spot five stories high. It also makes them easier to shoot or throw grenades through, like you said.
Everything on the map is interlocked and many parts of it are also merged into the ground. I'll try to get better screenshots of it soon.