Well, if you count defense in megaproject.
Here's Racklull:
http://mkv25.net/dfma/map-8354-racklullI think the pictures speak for themselves:
http://magicguigz.imgur.com/racklullYou can't really see it in the pictures, but the main good point (apart from the 23 100+ tile-long subcorridors) is that enemies always come from the same side for the same floor, so it's easy to know where the best operators go (I got 10 legends and I think it's enough, but I'm making 2 more just in case).
What I learned from this:
- Constructing fortifications is way faster than smoothing + carving. I still like the smoothing approach more though, for personal gratification (these building destroyers will never get me!).
- Planning ahead is good, especially for stairs.
- There is never enough trees for all masterful siege engines. But you can import a lot so it's cool.
I'm using DrD_AVEL's
Gold plated gorgeous tile set.
I haven't had time to test it thoroughly just yet, but I doubt anyone will get to my army at the end. Also, my best legendary macedwarf is equipped with an artifact piece of (admittedly bone) armor and a steel artifact mace. Between that and my 8 fully plated legendary army dwarves, I'm not too worried.
But it's mostly just for the warm fuzzy feeling of defense architecture, I probably won't have time to get sieged...
Still, I'm stockpiling on green glass blocks, I might do a submerged glass panic room while I wait for the first 2010 patch.