Took about an hour to cobble together the arm rest using scrap lumber I've had hanging around. In fact, when we had the new Andersen Windows installed I had to remove valences that the previous owner had installed. It took a while to remove hundreds of staples and padding, but I got a good amount of useful 1X4s.
I held each part on the refinery as I went along to ensure that it would fit without impinging on anything. I use SPAX screws exclusively when building wood stuff for the trains. They are far and away the most sophisticated design that works perfectly. They TORX drive so they don't cam out. They have a fluting on the threads that helps cut the threads into the wood. They had a thinned neck above the threaded section that the lets the upper part of the screw to pull the two pieces together. Not all Home Depots have them. I started using them more than 20 years ago in Germany when I built the first version of the RR. Since then I've found them in the USA and they're now being manufactured here as well.
I tested it with the pillow. I can get way over the refinery and will be able to work that difficult space without any interference. I can probably use in other areas as well in the back and over the town. I can disassemble it and change it's shape and size to accommodate other areas of the layout.
