Thank you for your thoughts. After posting I thought about doing more research via google. I checked out the depth, front to back... of sewing cabinets by Arrow & Horn of America. I discovered they are not more than 21" in depth front to back. It has been so long since I have had a built to fit sewing cabinet I had forgotten there isn't much room behind the sewing machine.
I will keep researching, measuring and thinking so I come up with the perfect for me sewing table combination. Any further thoughts are very welcome.