Thanks, this is really useful.
The bench thing is a real bug and it's fixed. A tired dwarf was walking to the first bench you ever built instead of the nearest one. That went out in the build I uploaded today, along with the same fix for tools, drop-off points and which side of a building a dwarf walks up to. All of it was measured in straight lines before, which doesn't count for much through solid rock.
Floor 14 is genuinely the current edge. There's nothing past the diamond seam yet, so you didn't miss anything, and filling that stretch is the next thing on my list. The pacing problem you describe is probably the same thing from the other end: not enough to spend on, then all of it at once.
On blueprints and ruins, the selection outline was drawing black instead of white and that's fixed, but you're pointing at the bigger issue, which is spotting them at all before you click one. That's still open and I don't have a good answer yet.
You're right about the deep delve, and that one is already underway. I'm drawing the art for it at the moment, so crossing that threshold will actually look like crossing it.
The font is the second time I've heard that now, so I'll look at it again.
Latest update notes are here if you want the full list:
v0.1.0.8645: The Hauling Update