Hi all,
I made a thread a while back about having just returned to the game, many new features and all. I decided to punish myself with the desire to build a surface city, but I'm starting to fear that I royally screwed things up. Hopefully not, if someone has a good answer to the woes.
Here's a picture of what's there so far, with the dwarves temporarily residing in a small area off to the right. That's where they've been toiling day and night to make claystone blocks for the new city. This is the beginning, or its center.
https://imgur.com/a/8h2sWAs you may be able to see, I started off by building downward one level. I intended to construct buildings upwards from there, but have them sealed off at that bottom level. It'd let me grow subterranean crops to supplement the tons of apricots and persimmons I get from the surrounding trees. After that, I was going to flood what was left of the pit using a nearby river to close off the unused parts of said pit/for decorative purposes above ground. The Z-level above the pit, the surface level shown on the map, would be the actual ground level of the city. Hope all that makes some sense.
Anyway. I dug my one level pit, I manufactured a heap of claystone blocks, and I outlined the pit with a wall. As you can see, I then began covering the pit over by using the claystone blocks to build Floors (b < C < Floor). I was then going to build the city atop that. Problem is, I can't because the game considers a construction - the floors - to already be in the way. You can see that I was starting to build an inn for visitors as my first building, but the only reason its walls even exist is because I removed the floors under them. I can't build stairs up for a second floor, among other issues.
Is there some sort of alternate flooring you can construct and build upon, particularly for the surface? One wonders how you could make buildings more than one story tall if the Floor construction is considered as taking up the space.
Ah, how I hope I haven't wasted all of my work! It would've been easier if I hadn't tried to build over the pit, I'm sure, but someone suggested it and it seemed a sensible idea.