I would say it depends on how (if?) it arrives from the supplier. Everything pre-assembled counts as one. That’s how it works at the factory I work at, but I will not claim to be an expert in the automotive industry.
I might have seen some of those things get broken at the Space Needle event. I got to sit in it (spacious) and asked permission to touch anything (sometimes yes, sometimes no). Not everyone was so respectful.
I don’t know where, but somewhere on this forum it’s posted that Slate plans to let all reservation holders take a test drive once they’re ready.