Brian, I am not onan,
BUT, went to SPI in San Francisco, 2017, and the B17 was there, looking finished. Very impressive box! It was not making power, but all of the mechanicals worked well, meters were lit, modules were swappable, electronics were in place, etc.
A Rosie 3D-printed enclosure was there, as well, but, IIRC, there were no electronics inside.
SO, seems that we will not need to wait too many more months before some units might become available.
FWIW, Vic