We were driving up country with friends and stopped for lunch in the wonderful little town of "Makawao". It's a old cowboy town. We looked around and I peeked into the Aloha Cowboy Store. Low and behold there was a G scale train running on a wooden ceiling layout. I asked the owner if it was home built. No she said, it's a kit. http://ceilingtrainkit.com/
She said it comes in "O" gauge as well as other gauges. Also they have bridge kits, switches, anything you need. I took a few pictures for you guys. Just thought if ever I did anything like this, I would use this kit. Don