Yup, also I was testing two things just now, I bragged to someone that I knew how to make Guts properly, metal arm and all, but didn't get it right when they tested it, the arm wasn't showing up so all they could do was shoot fireballs with it, still fun, but not what I wanted.
So I figured out what I did wrong, got it working partially and thought of a way to test it by grabbing a burning corpse, which showed me that amusing fact that I had flesh and bone fingers on a metal upper/lower arm and hand!
Fixed that (first I pulled the left arm out of the humanoid_guts copy of humanoid_neck, then I copied the fingers with con:rh into that body plan, with the guts_arm plan having fingers attaching to con:lh) and went back to test while also working on my KSBD swordmasters, since they've got four "maybe sword" appendages used for the whole flurry of blades type of cinematic effect it's convenient being able to make them out of metals.
Did I mention they're 1:1 prepare/recover with independent multiattack?
Yeah, remember my party trick of smacking someone into the air and cutting their head off?
With these things you can cut off a limb
and hit it several times in mid-air before it flies away which really should end up mid-air butchering it, honestly, but is still a surprising discovery.
But yeah, my poor test subject, she's standing there naked and crying, looking at this strange naked woman with a metal arm walking towards her, there's a sudden rush of air and blurred movement between them, then her arm is getting batted around in the air before being picked up and set on fire, and as the horror starts to set in, this metal armed woman starts to bludgeon her with her own burning arm while also crying and bleeding from the parts of her body that don't happen to be fireproof, before the two of them are wreathed in clouds of boiling sweat and blood and tears.
Modding is a weird and dangerous drug.
Still, before I bled out I was able to confirm that it worked, partial cyborg and Berserk-type vaguely-steampunkish mods ahoy!