Yes, that's right, there's an Earthship in Washington state! (at least 2, actually)
The owner has agreed to have us tour his Earthship. It's going to be under my responsibility as the owner will be out of the country.
RSVP here if you're in, and we'll arrange carpooling. It's almost 4 hours away from Seattle (to the East, close to Carlton, WA).
We should leave early in the morning and back to Seattle in the evening.
Confirmation: The tour will be only on Sunday, no overnight stay, at least for this time.