1) If possible its best to split them up into various piece, ie boots, greaves, cuirass, gauntlets. If you cant, add it to the cuirass lists. The NPC's will equip it since it will more than likely have a higher armor rating. Not entirely sure though. In my leveled list mod, I have several piece that are greaves and boots together and the NPCs equip these instead of singular boots and and greaves.
2) They wouldnt be able to equip it since those armors arent rigged to the skeleton body. it would only appear in the creatures inventory
Thx John, i love your mod and waiting for next update

As I recall, the choice of which items get equipped depends principally on the value of the items. I'm not sure whether it evaluates that this single boots and greaves item is actually worth less than these separate boots and greaves items are worth together though.
Vac
i'm thinking about enhanting these custom items and placing it to the only magical armor/weapon leveled lists. Did it mean what final cost of the suit and NPC's choice would be depended on enchanted effect?
And one more question: How can i test it? Is exists any suitable room somewhere in testing hall or something like it?