First, thanks to Truckasaurus who is well ahead of us on his project and whose Sketch-Up design has been very helpful.
We're going to finally get the frame and floor renovation done within the next month or two. Oh, and maybe we'll get the windows and door gaskets tight so the Airstream is no longer an aluminum aquarium.
Frame and floor requires some design decisions on electrical and plumbing systems.
I think the AC will need to go on the roof. I don't like the ductwork idea so I'm thinking about two propane micro-heaters, one forward and one aft. The LP gas plumbing should be simple enough.
On the water side, we have the fill tube forward and could but the fresh water tank behind the sofa (in its OEM location). We could also look around the axles. I know opinions are sharply divided on composting toilets, but I really like the idea of no black tank. My wife and I plan to spend most of our hiatus at campgrounds with facilities... and to use the head in the coach lightly. A gray water tank is necessary, but we're looking at moving the weight to near the axles.
On the electrical side, the entire coach will be rewired. I like the idea of dedicated ground wires on the 12v lighting side (rather than ground to body). I also like the idea of additional wiring to make the marker lights work as turn/stop indicators. The convertor, breakers and other wiring will be accessed through the rear panel and located under the bed. I'd like a rear bed design that allow the mattress to be removed to allow top-down access to everything.
We're hoping to incorporate solar panels, AGM batteries and LED lighting inside. I think a retro "gas light" would be kind of fun.