"I was wondering if an airstream could have a small porch on top or even a collapsable canvas room to sleep in on the top of an airstream. I figure a bit of reinforcement would be due but i cant see why it couldnt." Sure, it can be done. Probably won't cost much over $150,000.
Seriously, as others have said, this isn't a job for an amateur. First you will need to figure out just where there might be enough space to actually use. Then you will need some structural analysis to figure out if you can add any additional stresses in that area, and if so, where and how much. THEN you can start to think about what that new structure will look like, and how that will affect the aerodynamics of your Airstream.
Even other brands that have "flat" roofs have weight limits for them, and the roof isn't really flat, either. There will be a crown to make sure that water doesn't stay there. Some motor homes do have provisions for using the roof for more than just holding the air conditioners, but they were made that way from the beginning.
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David Lininger, kb0zke
AIR 54240
Heartland mpg 181 (sold)
1993 Foretravel U300 (sold)
2022 Grand Design Reflection 315RLTS
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