Here's "The Expense" observatory at Cosmic Acres, Joshua Tree, CA, in operation. Inside is my 12.5" f/23 Classical Cassegrain with Teak plywood tube and Ed Beck (Enterprise Optics) mirrors, aimed at Mars. I turned on the porch light (ids approved, with low-wattage LED bulb, not this bright in person). The observatory is air conditioned, so I was able to set it to the evening temperature forecast so the optics don't have to equillibrate and I can get right to work.
Now THAT observatory is worthy of the proto-goo! It looks fantastic!