Not blasphemous at all. Old Airstreams get gutted and rebuilt all the time.
Like a fisherman you will have to wait and see what comes to your net.
Failed restoration projects turn up from time to time. Best, and cheapest, all around best value for the money would probably be a 31 footer from the 70s or 80s. But it depends what turns up on Craigslist or Kijiji.
As others have pointed out, an Airstream will make a lousy office and cost more in proportion to the use you get out of it than most alternatives but that is your call. If anyone understands the lure of aluminum it should be this forum.
Be sure and post pictures of your project and as others have hinted, pass along any usable parts you gut out of your project. Help keep someone else's trailer original if yours isn't. Kind of like donating your unwanted organs to save a life.
Living in the trailer park of sense, looking out the window at a tornado of stupidity.