Each Unit Filler is to replace 9 Night Goblins. The tents are simple enough. They each came from a Battle for Skull Pass boxset that I purchased while building this army, and the Snotling Guardians are left over parts also. It consisted of the baggage train from BfSP, along with an Empire bucket of green goo, Ogre satchel of bones, and some Dwarf shields from the barricades.
Not much to say about them to be honest, so will let the pictures do the talking..