I headed to Home Depot this afternoon to pick up some wood to build a base for the lift chair. The project went relatively smoothly, and while it's not the prettiest bench in the world, it has a lot of meaning and I love it. The extra depth in the back is due to the balance of the chair. It is naturally weighted to be back heavy so it tilts back while hanging on the lift. This extra depth in my bench keeps it from flipping over. And thanks to a suggestion from Tim, the plywood on that extra depth makes a great place to set your beer. The bench is now sitting out on my deck and will be a nice place to sit while I'm cooking on the grill.
The vertical bar is stored safely in the back of my garage and will be reunited with the chair once I have a place to hang it.