Here are two Airstream websites I use quite a bit. The first is a link to the Airstream, Inc. documentation. If you search travel trailers, then model year 1972 you can see the floor layouts offered that year. That may give you some ideas.
The second is a vintage Airstream Resource that has a photo section where folks have posted photos of their year, and model trailers. Find Ambassador and 1972 and see photos of how your trailer may have come from the factory.
You may have already visited these sites, but here they are again.
The floor plan for an extended living arrangement might be different than a travel trailer. The rear bath might be okay, plan sleeping space for everyone, likely a bigger fridge, design eating room for all like a U shaped dinette in front. There is not much storage room in an Airstream, but your 29' has more than many of them. It's gonna be a big project.
David
https://www.airstream.com/owners/doc.../tt/year/1972/
https://vintageairstream.com/photo-a...ambassador-29/
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