It took me quite a few iterations until I was happy with the aesthetics and functionality, maybe someone else finds something useful here. [Blueprint] (https://imgur.com/Kh3mXJW)
The rectangular chamber next to the entrance will contain my industry. I like this open, with a few gratuitous minecart tracks. The residential area reflects my dislike of corridors, the t-square fractal allows me to do away with them and gives me useful rooms with recesses for unique zones. 3-way doors are a pain to build (repeated accessibility complaints) but allow for less wasted space.
Now to the colourful maze in the northwest: If the 1x3 drawbridge is closed, unwelcome guests have to path through the whole thing. Connection via diagonals only, because some may smell bad. The bridge right at the entrance controls whether they pass over cage traps or not. The magma misters consist of N/S ramp tracks in the channels filled with 6/7 magma, surrounded by fortifications except at the ends. Iron or nickel minecarts will jump from one ditch into the other and create magma mist in the process, a central floodgate provides a shutoff. Hopefully, this disposes of invaders cleanly. If not... well, they aren't quite through yet.
The uncovered down stairs enable drainage from the drowning maze. When the drawbridges raise, they block the exits and cease to cover the inlets, routed from a reservoir above through the central tile. They are triggered by a pressure plate in addition to a lever.
The minecart loop relies on impulse ramps to spin multiple carts (5+) clockwise, contrary to expected direction of invader travel. More impulse ramps allow feeding carts safely, and automatically redirect ones that would be thrown out somehow. Retracting bridges on the corners allow a shutoff. From my experience, this system recovers gracefully from crashes and jams, at least when all minecarts have the same weight. There's another magma mister in the middle, against my better judgement: it's too close to water really, and while minecarts haven't been tossed through fortifications (all 3 tiles to the north and south are solid walls here, lest our bridges throw carts where they don't belong), I'm not sure it's safe.
A final drawbridge allows walling ourselves in entirely, or atom smashing junk/stragglers.
There has to be an explanation as to why service of most to all providers comes to a halt near exactly the beginning to the end of the front perimeter?
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Hola I am young tech dev. I haz finded Fort NOx bypazz method. Plz click tanks to download and buy me bere secretly becoz im very young
