Vault of the Goblin: Connective Tissue

Inspired by the Bridge of Khazad-dûm, I've been thinking of the Vault of the Goblin as a series of nodes that are connected by larger expanses of 'not much'... long tunnels, great empty caves, and the like...

Of course, there are the areas that are off (or along) the beaten path, but which are smaller expanses of 'something' that are not tied directly to a node - the connective tissue of the nodes. These are almost like random encounters along the path between nodes. I'm going to formalize these in their appearance, but I'm still thinking of ways to randomize these as well...