This is in a stable, self-sustaining fortress of 120 dwarves with a strong military and layered defenses so the labor pool is not a problem.
Range: 15 is max but effectively it’s less, so just to speed things up the L wall was moved in closer. Doors get blocked by parts and clothes and butterfly wings so there is another isolation bridge.
Decay of clothes: doesn’t happen. Dwarves on their own initiative change to the higher-quality duds when available, cast-offs showing wear accumulate in a stockpile that is next to the Depot making for quick and easy trading. A Smashing Bridge over the stockpile would also work, I just like to get rid of as much “stuff” as possible to optimize FPS. When a ☼somethingorother☼ is traded, there’s no accompanying bad thought like when a thief makes off with it. Masterwork clothes don’t seem to “deface” when wearing out.
Spacing: the 4 spiders are pastured in a 1x10 line right next to the separation bridge. They wander around a bit but being spiders, they don’t seem to mind. I put a Farmer’s workshop in there planning to milk the venom but, doesn’t seem to happen. At least, the farmers always prefer to milk some dewbeetle being farmed elsewhere for leather studs.
Backups: yeah, each legendary dorf has several apprentices; I train migrants as they arrive to have a moodable skill. Males are trained for military. Fems for everything else. This farm generates more silk than would ever be required but it’s just a Stupid Dwarf Project. If something happened to it, a plot of rope reeds would still generate more than enough thread. The legendary dwarves are warrened in what is basically “everything except the exposed surface.” Cave adaptation isn’t a problem because the main meeting room, Depot and main hallways are all -1z, with roofs channeled and covered. Dimple cups are supplying the primary dye and it’s been pretty impressive just how valuable the clothes are. There are many ways to keep dorfs ecstatically happy, this was just something to do while waiting for the mages to level up in this fortress as I try to learn sorcery. It's taking a long time to home-grow a White Witch Hunter.
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Edit: this is just a test, 14 February, to see if modifying an old posting moves it up on the Masterwork screen directory.