Zooming in from a 1938 aerial view of Waterbury on the UVM web site produced this screen capture. The Perry Granite shed is clearly visible with its "Rock of Ages" lettering on the roof:
Eventually this building would house the Cooley-Wright Manufacturing Co foundry. Google maps street view of the building. It's in pretty good shape considering how long it's been around.
The granite shed is inching closer to the top of the "to build" list. (I want to complete the buildings to the left of track in the aerial view first). I'm planning to include the rooftop lettering - hope I can come with an easy way to recreate it.