Since I just got out for Christmas break, I decided I'd make a fort similar to yours in approach, recording its passing years on the forum
I will build a giant cylindrical cast obsidian tower, spanning through all the cavern layers, and perhaps anchoring on the semi molten rock, and reaching up to the end of the sky. In its upper levels there will be tree farms and food production, which will be automatically regulated (with limited stockpiles) such that food is neither over or under produced. through its center will run a bore of magma, to feed a massive magma-mine system on the surface, and possibly in the caverns. it will be separated into sections which will be closeable from one another by my own obsidian gate design. Every section will be flood able with either magma or water.
Before I start, do you have any tips from your own public mega fort? Any ideas on what sort of place such a fort should be built at, and or tips on what features of such a fort are more or less important? Do you have any tips on building functional room systems in a circular perimeter, while keeping things tightly packed? any other features I could take up space with? I also haven't decided on the diameter of the thing.
My preferred location would probably be a slightly hilly terrifying jungle with nice water features, such as a lake. I'm considering only using one cavern layer, and a slightly shallow world (like I usually do), but does that cut down on the epicness? I'm flexible with location.
Anyway, I'm sure moving to an absolutely terrifying place would compensate for my tendency of modding out clothes, genning shallow worlds, and playing around with the metal raws in stupid ways (like making platinum a weapon grade metal, and whips a dwarven weapon. probably wont do that for a challenge like this tho). I might remove most trade good from the raws, to reduce the number of irritating useless artifacts which just sit around collecting dust.
Well, I want to be able to upload plenty of images, but I have a slow 'net connection. Anyone have a image sharing site to recommend for my purposes?
Again all ideas are appreciated.
EDIT: just made a page for it:
http://www.bay12forums.com/smf/index.php?topic=97678.0