So heres my big plan for my first Megaproject...
My project is underway. Heres a few screenshots of whats done so far. I would have done 3Dwarf, but glass just looks like rock of course, so it just wasn't cool enough. Use your imagination heh.
http://img.photobucket.com/albums/v247/ZBB160885/Extra/Viperarches-Forges.pngFirst up the forges. First to be built and still being used as a temporary bed chamber and dining room round the edges. I have to admit to using For Each Tile to help the magma fill up. I rather underestimated how fast the magma would evaporate and didn't dig a wide enough channel from the pipe. Above this, going up through the underground z-levels, its more or less an open pit, with the pillars going up and a few glass walkways to get to my farms and such. In the soil layers, I also rewalled all round the edge of the pit in glass.
http://img.photobucket.com/albums/v247/ZBB160885/Extra/Viperarches-Entry.pngHeres the ground floor. I haven't quite finished moving everything inside, so the road doesn't have its ramps and the valley wall is still up with my trade depot still outside for now. On the left you can see the brown strip of mud where I was pumping the river diversion while building the glass aqueduect. Pumping it back and walling it off would have been simpler, but I went for a little realism. I also used For Each Tile to give the new channels of the brook outside my fortress thier surface back, just for looks. You can't see the old parts of the brook since I constructed/deconstructed over them to turn them to sand. The dry moat was really an afterthought.
http://img.photobucket.com/albums/v247/ZBB160885/Extra/Viperarches-Barracks.pngAnd heres the first floor, only one complete so far. It will eventually be the barracks and archery range, but for now its just storage and a meeting area. I've set the pop cap to 70 at least until I decide if I can handle any more nobles or even the economy. I need to make some rooms to test thier value to see if it might be possible or if I should just turn it off.
The next floor will be food storage and food workshops. Then probably I'll be working as I would in my normal fortresses: finished goods storage, workshops, raw material storage, dining hall and meeting area, then just bedrooms. I'm thinking of tapering the tower as I go up, then having a rooftop garden or something and spliting off into 4 smaller ramparts for the really posh rooms.