I posted this
in a less popular thread
This is wood-frame construction that potentially could last 500 years.
My parent's house's exterior was hand-split cedar shakes with stainless steel staples, aluminum, plexiglass, stained cedar door and window trim, stainless steel foundation flashing and stonework. 50 year roof.
No gutters. It was designed with one on the stone wall.
edit: off-by-one simulpost.
If I could match your graphic prowess, I'd show a trailer that expands sideways twice. You could build it with the walls propped up and then slip floor joists in and drop the sides.