Sorry to necro this again.. we finally got around to art side of prototyping this and I misunderstood thinking you could key frame SLOT visibility... but this does not appear possible.
How do you key frame attachment visibility if you are using a programmed equipment system to set attachments per slot? I thought we could make a Torso_Front / Torso_Back slot and when walking down vs up it would simply toggle that SLOT visible with a key framed slot.