Assembly Pack
Assembly Pack packs geometry and a skeleton into an assembly, the packed form that the assembly nodes carry on one wire. Natsura's own assembly nodes, such as Build Assembly Rig and Assembly Edit, use it inside, so you need it only to build an assembly by hand from a mesh and a rig of your own. Most kits go through the Assembly Resource instead. It is in the Tab menu under Natsura > Utility.
Inputs and settings
The first input takes the geometry. The second takes the rig: a KineFX skeleton whose joints are named, with the geometry captured to those joints by name.
With Use Name Attribute on (the default), the node makes one assembly for each value of Name Attribute (assembly_name), and every primitive on both inputs needs a value, or the node stops with an error naming the input. With it off, everything goes into one assembly named by Name, which defaults to the name of the network the node sits in.
Assembly Edit
Assembly Edit turns parts of an assembly library, or single joints in their rigs, after rigging, for example to make parts face the same way as the rest of the library.
Assembly Resource
Assembly Resource turns a kit of parts into a rigged assembly library for the Assembly Decoration: it imports the kit, checks the pivots, rigs it, assigns materials and previews it in the wind.