That is an amazingly prolific silk farm! How did you even get enough dwarfpower to harvest all that thread?
For my fortress, I'm planning on setting up a live-fire training ground for my marksdwarves using reanimation for fun and profit. Firing at a live enemy gives about 5x the experience that an archery target does, but either requires the use of cage-traps (which you have declined to use) or a massive engineering project (which probably wouldn't be worthwhile).
4 weavers with nearby looms (<20 steps) clear it reasonably efficiently. Other runners come with bins and collect the thread to near the looms that I use for silk cloth production on the main craft floor. But yes, it's insanely prolific. If I ran it for a year I could probably supply the entire world's silk requirements. Sikel Silk would become a cheap good in the far corners of the universe.
There's another way to get myself some live undead archery targets though...
Create 'shooting room'. Pen up some dogs. Flood room, drown dogs, drain room. Lotsa targets.
It's on my list of little projects to do while I wait for the military to be born.
Right now that list, though, is a bit odd (and subject to change on my whims...
):
Spelunk Caverns 1, 2, and 3. Find out the entry and exit points.
Dig out a huge mass of magnetite and then seal up the levels with stone walls to reduce pathing fps loss.
Dig out another huge set of levels somewhere (probably between 1 and 2), muddy the floor, and have a few massive tree farms. I'm hurting for lumber for mass projects... primarily for charcoal for craploads of steel. Create and seal doors when not lumbering for fps.
Find a location for a pumpstack from the magma sea, straight up to surface. Prep the aquifer pierce for it in a massive area so I can build it without annoyance. I have plans for that magma. No, it's not a FTL lever, either. Well, not really. Well, okay, but it'll be a PRECISION FTL lever...
Poke at the magma sea, see what candy I can yank out without disturbing the clowns. If possible, use the lake in Cavern 3 for obsidianizing the access.
Give my dwarves a little time off and let the lovers marry. I need more breeders.
Find my FPS leak. Somewhere in my fortress there's a massive FPS leak, but it's inconsistent. I'm not sure exactly where it is, which is why I've started to push the majority of the stockpiles out of the main areas. If that's not it, then I'm going to work on sealing up unused areas and setting up traffic zones.
Magma trap the trader access pathway. I get the occasional goblin or zombie that sneaks into the trader access. I'd like to simply stop worrying about that. Not sure I'll actually do this, though, probably more trouble than it's worth.
Find a 'clear' moment on the surface with all the non-pathing zombies stuck in a corner somewhere and start the baseline of a surface keep. Simple 20x20 with walls, ceiling, stairs, hatches, and raising bridges would be fine. I need to move a lot of blocks near the main entry first though.
So, there's plenty to do in the meanwhile.