Great stuff! I really like your goblin-to-dwarf conversions. Tolkien said his goblins were taken almost entirely from George Macdonald, and
he uses "goblin" and "gnome" as synonyms.
The (awful!) pedant in me couldn't help noticing this passage in your blog:
Then we have some GW Moria Goblins. I hold to the theory that Tolkien used Goblins and Orc interchangeably, but that Goblins are the smaller Snaga type Orcs.
I agree with the first part - Tolkien says explicitly that "goblin" is a translation of "Orc". But the second point is surely confounded by the fact that he uses "goblin" more than once to describe the Uruk-hai of Isengard (as well as various other larger orcs like Azog, Bolg and Grishnakh). And then there are the "goblins of huge size" in Bolg's bodyguard, who are formidable warriors and can hardly be Snaga-types!
Anyway, a great thread (and blog)!