Thanks for the thoughts. As far as conveniences going away, we are both comfortable with backpacking for a couple nights, but I don't think my wife wants the extended backpacker experience for several weeks at a time. We are good with minimal conveniences though.
"wet area" - I intend to buy a composting toilet, sink with gray water, and shower outside when available.
"paper plates" - We would much rather use plastic dishes than make waste. When we backpack I use a few ounces of water to wash our 2 dishes, and I drink the gray water. A few extra ounces for the convenience of basically RV living seems reasonable.
"water system" - Like I said, when we backpack for a few nights we are fine. But for more than that I would need (very much like) to proper wash my hair, and I'm not gonna cut my hair. I will put in a proper water tank.
"reheat food" - We always cook food. Never had a microwave dinner in my life, nor do I want to start now, but I might install a 600 watt microwave for leftovers. A portable cheapo coleman seems reasonable, and could be moved outdoors for cooking when weather is nice.
"bed and bench become one, bikes outside most of the time" - I am mostly set against this, but this may be SF bias - I've had several bikes stolen. From 3rd floor balcony, from being locked up in well lit attended downtown garage in the middle of the day, from inside a store when I turned my back for 20 seconds. I like my bikes secure, but might consider sketching up a layout with bikes outside while we are awake and in the middle of nowhere. But still, they would need to be inside if we are near town or asleep. Also the raised bed provides extra storage options. Something to think about.
"Electrical too small" - This I really have no idea. I'm a structural engineer. In other words, I hate black magic such as electricity. I was thinking 2400 Wh (2-12V 100Ah LiFePO4 batteries), 400 watts solar, battery to battery charger (I have a 220 amp alternator if that makes a difference), charge converter, fuse box. The fancy ass batteries save space vs the older lunks and last more charge cycles with less maintenance. Basically I just assigned a space as a "design development" placeholder. It could spread out if needed.
Here is a revised layout idea. The fridge by the door was scrapped - Top open fridges are pretty long and I like the cook stove by the door, plus trying to balance weight a bit by keeping the fridge on the driver side. Open to revisions of course. Scrapped the convertible bed. The rear workstation could be stand up at the bed, or pull out while sitting on the toilet box. I may have to chamfer the counter to provide easy access, but that shouldn't be too bad since fridges are typically not super deep (from a quick google search of various models).
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