Worksizzles was my most promising fort to date. I created a trade tunnel network that connected 8 points across the map to an underground trade depot. I forget the name of the forum member who first suggested this idea, but a big thanks to whoever you are!
Here's a portion of it representing the north quadrant (R = Ramp, D = Drawbridge):
RRR RRR
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DDD DDD
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DDD
DEPOT
DDD
FORT
At any given time, access to the Fortress was closed, while access to the Trade Depot remained open. When caravans arrived, they were able to path inside safely, with drawbridges closing behind them. There was a battle or two with ambushers, but the caravans were pretty safe from goblins. The only trade casualties I had were from a rampaging roc.
Given caravan spawning AI, only 1 path to the trade depot was needed, but the multiple spots were for the benefit of migrants. No matter where they spawned, they were always close to a tunnel leading to the fort, bypassing surface dangers almost completely. With soldiers stationed around the entrances and in the tunnels during migrations, I only lost three civilians that were caught by a goblin bowmen ambush. I once had a migrant wave that spawned just three tiles away from an entrance. They disappeared into the tunnel so fast that it wasn't until later that I discovered that FIFTY dwarves had migrated safely into the fort.
Things were going well, and at 230+ dwarves, I had settled into a comfortable routine. For this fort, I didn't use any traps or danger rooms, but I managed to create a formidable militia. Back in my danger room days, I only used Axe- and Hammerdwarves, but this time I let migrants train in the weapon skills they arrived with. My best fighters turned out to be a Speardwarf and a Macedwarf. The speardwarf slew the aforementioned roc, while the macedwarf routinely entered combat well before the rest of the troops, often slaying 6 or more foes ahead of reinforcements.
Good times all around... until a vampire struck. After combing through the nearly hundred adult dwarves, I finally found a "19 year old" dwarven female who had a longer history than dwarves three times her apparent age, and who didn't have any thoughts regarding the legendary dining room she was sitting right in the middle of. I was just about to take care of her when a migrant wave arrived that needed guarding. I set the vampire issue aside for a moment to get all the migrants in safely only to have her kill one of my original 7. At the same time, an ambush entered the tunnels and killed one of my best soldiers who had fallen asleep right before battle
. Both dwarves were relatively popular and caused my baron to lose it. He started a fist fight and then the tantrum spiral struck.
I haven't abandoned the fort yet, but I did manage to get the vampire charged and sentenced to jail in the middle of the chaos. Right now I'm trying to build an atom smasher over the vampire, but the tantrum spiral is still ongoing, causing tons of cancel spam. About 30 of my 230+ dwarves are dead. Not sure when I'm going to pull the plug, but I at least want this vampire smashed to oblivion before I do...