Width. Yes, you state the obvious good sir but a few things got me to this point:
My budget (new wife) thought it would be cheaper to buy some basket case canned ham and "restore" it. We failed to communicate that to me "restore" means replace every bolt - To her "Restore" means paint it with a can of Krylon, put up some new curtains and call it done. We have adjusted our expectations.
2. Available Space.
So I bought a canned ham doing ZERO research except that it would fit on the side of our house where it has to go... second point... we have exactly 7' 3" of width from the roof of the house to the new fence. (The fence which I will be "Modifying" late at night when someone is on vacation.) So my new design is exactly... and I mean exactly 7 feet wide. Fittings will clear as they are below the roofline of the house.
3. Project Creep
The the more I dug into it the more I hated every rotten stick of wood on the old canned ham. I went from fixing wood, to replacing wood. Then I made the glorious choice
of getting on the Airstream forums and realized that Airsreams are built to last and I wanted one! then I had to replace wood with aluminum C channel now I might as well replacing ALL the dang metal! Hell, at that point the only thing left of the original trailer was the metal frame and the windows. So why not start all over!
So, basically I bought a donor canned ham cause it would fit our limited space. Re-furbed the rusted trailer bits, replaced the axle, and built a new floor. Then decide to go whole hog.
I'm having fun!