After almost 3 months break, I've started work on the aircraft again. Deburred the replacement gusset brackets & inter-skin ribs for the elevator. The inter-skin ribs answer the question of the mystery holes in the skins & the gusset brackets will replace those already installed that did not line up with the holes in the skins. I'm now waiting for a replacement R/H elevator skin as the original has the trailing edge fold incorrectly positioned, not allowing the trailing edge to be straight.