I gotta remember that for a different idea I wanted to implement once .31 was in a more stable condition to play, and I got used to a few of the newer/improved/inconvenienced features. Farming especially.
With all that in tow, I wanted to make a cliffside fortress with towns budding off the cliff-face and a city-like entryway. Of course, the catch to getting inside involves crossing a major drop-bridge with several dick moves interspersed throughout. Of course, the lowly serfs at the bottom of the cliff have to gather up the remains and goblinite, provided it's still intact. And building it with 100z high cliffs sounds rather nice.
As for a seemingly impossible idea I managed to achieve? Airship, is all I have to say. Of course, overcoming it was simple. Shut off cave-ins.
What do I do with something that simply can't be done? At least in DF, I just say "fuck it" and try to see if it's possible. If not, I'll find another way. Persistence is the dwarven way. How else did you expect such a glorious ship to sail the skies (and be built in less than/roughly a decade)?
Plus, a repeater/boiler concept I made failed epically, however, it still works as a semi-probable/functional aesthetic element. Using the pressure plate inside, that makes the boiler sorta power whatever it's linked to. I intend to make a more proper repeater "connect" to it while being "powered" by the same boiler. In order to power the entire repeater, the boiler must be activated, so to put it.