In one of my first forts I hit 260 population. The thing reeked of zero central planning and was cobbled together in a pretty amusing manner. At around 180 pop I struck adamantine (frog clowns so only lost a war dog and a miner) and got a 40 dwarf immigration wave. I eventually smelted all of the metal on the site, cut all of the gems, harnessed all of the water (drained all of the murky pools into a cistern, was no stream/lake) and mined almost all of the stone. Since the mining, hunting, smelting, smithing, ect. industries completely died out I had to massively shift my economy around. About 200 dwarves were set to masonry and I built a big chalk and bauxite block castle outside my original door, paved and leveled the majority of the map (which also killed the already struggling timber industries) and made various outside constructions within the new walls of my mountainside castle, including a dwarven high rise apartment building and several large outdoor farm plots.
Eventually I even started running out of rough stones, making them all into blocks. So I had to shift the economy away from masonry and to farming, glassmaking (using glass furnaces over clown magma), and leatherworking/butchery/bone crafts made of kittens I traded lavish meal barrels for any other resource I needed, the farming trade economy actually works out quite well once you have enough seed stock and dwarves to sew it all. A few barrels of prepared meals buy out a caravan easily, I even bought that useless elf garbage and used the cloth to start up a strong decoration industry.
After doing that farm thing a little while I obtained enough wood in trades and enough goblinite to resume limited steel production, not that it mattered because I had an army of 40 champions with almost half of them being in adamantine armor, all of them legendary wrestlers and legendary in at least 1 weapon skill, and many of them were using artifact weapons. Heck, most of the time the ballistas shooting steel bolts combined with the 6 champion marksdwarves I always had stationed on on the walls would rout the goblin sieges before they even got close enough to scare the siege operators. The fort was to the point where nobody was ever dying and I dont think it ever would have ended without me trying to end it or quitting it. I even had a few megabeasts try to invade but they all got riddled with crossbow fire or wrestled to death.
Unfortunately FPS is a killer. Started lagging once I opened the funhouse. Was at around 2fps when I quit, it was to the point that I would just mass designate stuff then leave the room and read a book and come back an hour later to designate some more stuff.