Your town looks awesome!
As far as answering your question about what to add... you already said you were doing a hanging tree, so I guess a hangman's platform would be redundant... maybe some stockades? Shacks, out houses, or a mill?
Staying in Wyrd fluff, you could always add a "mountainous pile" and create an entrance to a soul stone mine? What would be cool is to build a seperate terrain board of mine shafts, etc. So you could game in town, and then move the story/battle sequence to the mine and switch tables to the mine scenery.
Ok... sorry bout that - I get to babbling! :blowup: