You might see if you can get the winter edition from last year of Airstream Life magazine, I did the article on Classic motorhomes, and I am sure you will find it good reading on the history.
Many unusual one or a few of a kind units were custom ordered, and as you research you will run across photos and descriptions of them.
From the NASA Astro van to Hearses, ambulances, taxis, limos, rolling computer labs, nedical and dental, etc. Since their original build a lot have been reconverted to motorhomes for family use, rolling studios. display mobiles, sales showrooms, and more.
The value of these is best stated as above= $15 - upper $20,000 for a 270 in great shape with what seems like a nice exterior finish, albeit an unusual paint scheme, and depending on the interior functionality and so on. The higher priced units are exceptional in condition and function.
Welcome aboard, we love to see "new" Classics in our midst!
also check out if you haven't yet;