On the eve of the new version, I'm planning my fortress out ahead of time. I have a few questions regarding the Z axis construction.
First of all, how do I dig down? Won't my miners get stuck in the hole that they dig? Is there some sort of temporary ladder I can pull up and put down, or do I have to make a staircase? Can I remove this staircase from above? Can I dig up, and how do I deal with the same problem? I'm basically wondering how I'm going to dig pits and moats without getting my guys trapped inside.
My other question is about fortifications. Can my marksdwarves shoot from a higher Z plane to a lower Z plane? Can I carve a fortification in the floor so they can shoot straight down? Can I put fortifications in the ceiling and shoot straight up? Does a higher Z plane give the shooter any sort of advantage? Do the same rules apply to siege equipment?