Written update for the moment:
FC continues to truck on, ignoring amushes, undead, and similar concerns. Worst case scenario we seal up the OMG's front door until things settle down. The undead in the hole are being annoying for trying to run my ice wall along the south, as expected, and we're dumping a lot of bolts into their mostly dead bodies. Free practice! We're going to seal them in Cask of Amontillado style and call it good. I'm hoping we can seal them up before they become indestructible. Occasional clouds of dust throw us off, too.
I've sealed off the trader access completely. One giant wall, have a nice day. Good luck on the surface. 60+ undead up there and they just won't path into the OMG en masse. They trickle in, one at a time, about a week or two between each one.
Lots of 'where'd the rock nuts go?!' spam as I screw around with making oil. I built a small dual minecart run between the crafting level and the tree farm to speed up gathering (about 5 fold, I'd say) which will take about 30 seconds to show you guys.
I threw a few dogs into the Live fire Pit for now. They'll eventually die of old age and then I'll have what I need from that. They're females, so they will probably birth some extras to play with.
I'm trying to get the new metal workers up to snuff so we're churning our steel back and forth again, with the occasional masterwork actually appearing. A few more kids have grown up and have been dumped into the military.
On a more Benny Hill style note, I released 20 War Dogs to be put into their cages at once, so right now half my fort is running everywhere trying to track them down and drag them back to their cage. It's kind of cute.