This was an extremely interesting read, especially finding out that perhaps the router chip is the real power onboard. Got me scouring ebay for old Sun hardware
If you just want a Sun Ray laptop, the Tadpole M1400 (sometimes mislabeled by sellers as a Compal FT-01, since that's the OEM system it was derived from) is not hard to find with a little patience, but it's "just" a Celeron system so it's not nearly as interesting.