I've been bingeing on worldgen a little in the new version, and I finally found a site I really like: It's got a magma pipe, ocean, fire clay, sand, hematite, copper. I think sitefinder said it even had flux - I've yet to find that. I'm playing in a 6x6 embark, and I've got about 200 z-levels to play with eventually.
I do have a question, though: if there's no goblin civs listed, does that mean I'll never get a siege? I miss goblin Christmas. It's been five years, I'm near a hundred dwarves, I haven't seen a single goblin or kobold. Not even the rhinocereses, or elephants, or tigers, or jaguars have been any trouble. My woodcutters are a bit scared of cavy sows, though.
I actually have a relatively complicated plan in mind for this fort; I'm trying to see how hard it is to cage-trap mermaids in the new version. So far I'm up to G: set up sustainable glass operations to make corkscrews and glass blocks for screw pumps. H-M or so involve building a giant lattice to drop magma ... well ... everywhere. Stoneware bricks for the scaffolding, holding tank, and sluices, glass and nickel (I have massive amounts of nickel) for the machines, and... yeah. It just doesn't seem hard enough without people trying to come and kill me.
I have lost two dwarves, when I was breaching the magma pipe for the initial flows. They're buried within the center of my ever-growing lava works. Eventually, their coffins will be the only two things in a small room sticking out into a massive magma flow (even though magma doesn't have flow).
U-X in the plan involve building an underwater observation dome out of glass, for adventure mode.