I am making my first assets for the building editor. I can't find any guides, and I have some questions:

1. How do I include skins? Is this the following section?
$ELEMENT_NUMVARIATIONS 3
$ELEMENT_MESH 0 window_23_var1.nmf
$ELEMENT_MESH 1 window_23_var2.nmf
$ELEMENT_MESH 2 window_23_var3.nmf
$ELEMENT_MATERIAL 0 material.mtl
$ELEMENT_MATERIAL 1 material.mtl
...

I don't see 3 choices in the building editor. I want to have a new and old lamp, and a version with an emission and without an emission for another lamp.

2. How do I make the dds preview images for the editor?

3. What is the maximum number of elements per pack?

4. Can the elements have a light included?

5. Can the elements have other aspects, such as particles, connections, or something else?