And welcome from Colorado: We moved here from the Twin Cities area of Minnesota. I worked in Eau Clare for a while. Wisconsin is a great Airstream travel destination.
I have a 75 Overlander, built somewhat similar to your 78
Sovereign, although there were some major changes in 78. My wife is thinking I should build something similar to what you envision.
My son has a 69 Globetrotter. He wanted a "U" shaped dinette in the front of his trailer. So we built one. It utilizes a pedestal table that collapses and then the cushions form a big bed to crash in. Airstream makes such a "U" shaped dinette in some of their recent models. The "U" shape also creates more seating space "around" the table which was important to my son. He also made "leafs" for the table so it can fold into a "coffee table" or out as a dining table. It works for him.
Here is a photo of it up and collapsed. Maybe our project will give you some ideas.
David
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WBCCI #8607 VAC Region 11
KnowledgeBase trailer renovation threads: 69 Globetrotter, 76 Sovereign, 75 Overlander, 66 Trade Wind Such fun !