We travel in our Airstream 6-7 months a year and needed something more comfortable than the dinette/lounge arrangement. We asked the Airstream Factory Service Center if they could install the front interior components of a 30' recliner model (2010-2015) in our Airstream. They did a great job and we are sitting here now watching the football game on tv while in AZ.
Your rear dinette model is different from our front dinette model, our furnace is under the sink and our converter/charger is next to the fridge. On yours I think the furnace would have to be moved a couple of feet to allow recliner leg space on the FB model. A hatch could replace the original furnace opening on the exterior.
I don't know the difficulty of this but a member here did it himself. For your model, if the furnace can be moved, I would forgo the side table in favor of a narrow folding table, attached to the wall, between the recliners for dining. Just swivel the recliners to face each other. We extended our center table top since these photos for dining and she uses the side table for hobbies and crafts. It's a very functional living space.
So for a look at an in-process conversion that may be useful to you, here are some photos we took at Jackson Center. The technician's name was Jon and we highly recommend him, he'll do what you want and do it well.
Our total cost was about $4200 for all materials and labor, moving the furnace would be more. Not cheap but we would have been pushed into a larger trailer without it, and we love this mid-size trailer Airstream so it was money well-spent.