I just know someone somewhere will design a fortress that can transform into a giant robot once some of these dev list items are implemented...
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(Late late late late late reply on this, I know, but I've only just gotten the time to even attempt to trawl this thread, but am too impatient to leave this point until I get to the end, so...)With fully implementable moving fortress sections (e.g. several relative reciprocal movements capable of causing absolute movements of the whole) I can see the megaprojects starting off with "pull lever A to raise central foot and rest on outrigger pylons, pull lever B to move foot forwards, unpull lever to lower central foot, unpull lever B to return foot to back and send fortress forward a notch, rinse, repeat" as a proof of concept, and ending up with dwarflogic-controlled cyclic mechanisms sending a multi-legged mecha-fortress 'beastie' scuttling (in a large-scale slow motion way, of course) across the landscape, needing pressure-plates mounted against the legendary leg-ends to reliably take account of landscape contours and ensure that[1] the whole structure doesn't trip over a small rocky outcrop, pile into an inconvenient cliff-face or dive straight over a precipice.
(Although small soiltype-only rises in the landscape having their tops scraped off by an itinerant limb would be interesting. And a valuable clue as to what had happened with your mobile city if you'd turned up in Adventure mode, set it going and then accidentally fell off the side due to one of the inevitable shifts the structure would need to endure, being knocked unconscious for long enough for it to wander off under only its pre-programmed automatic control.
)
[1] Especially once it's no longer possible that one wall tile near the edge can
obliquely support a huge and otherwise 'floating' castle over the top of almost all of the rest of the map, without some form of dislocation/collapse at the most least reinforced stress-point!