I've been ignoring this thread, and quite pleased by the responses now that I am back!
The circles are all done by hand, it's tedious, but I've enjoyed it a lot.
The workshops are spaced in such a way that MOST dwarves will not be bothered by the noise, but the waterfalls + legendary dining hall ought to balance the bad thought out more than a bit.
As for the asymmetrical circles, that is being caused by the scale of the photos. I assure you that everything but the tower cap farm (which is still incomplete) is perfectly symmetrical.
As for the flooding issues, I am in the process of harnessing my drainage tubes for further energy so that I can install pumps to make flooding nearly impossible.
Further construction of a huge shopping district above-ground is in the works once the economy starts.
If the new version allows me to play somewhat lag-free at 200 dwarves, I might raise the cap to 300 and play around with 100 extra dwarves...
As for anybody who was wondering about the design, it all sort of just fell together. I like fractals, but none of this was done with fractal design. I tend to not use them in construction. I like circles in combination with symmetrical layouts, and I absolutely love moroccan rugs and indian tapestries, so I like to make designs in general, and I find that a lot of my work is reminiscent of those designs.
I'm a big planner. I love planning in advance, and I love starting new fortresses. This one is going to be a bit of a chore, as my Dwarves are going to have to make the most of too much space at first, and work continually until my first wave of migrants arrive.
I will be incorporating choke points into the design, and setting up temporary workshops and stockpiles until I can get more dwarfpower.
Farms are going to be tough to get started, as there is NO water until I tap the underground river and pump it into the fortress, which involves a massive water tower, and hundreds of tiles of constructions to build the suspended aqueduct.
I'm still planning this fortress, I've only got 145/200 dwarves occupied right now, and only three more craft districts to make. I have the feeling that I went overkill on my glassworks, but it's okay, as I can throw jewelers in with the glassblowers. I still have to plan my armoury and military quarters, but I think they will both be under my main entryway, so it should be pretty easy to accommodate them.
The design itself is more fun for me than watching the dwarves do the work, but seeing something completed is really cool. One thing I'd like to do once I have 200 dwarves, is dig out everything, and flood it with Magma, and then flood it with water. It'd be nice to have an entirely obsidian fortress.