interestingly, the Millennium H155s don't all have access panels. I've seen several. The interesting thing about this Millie is that the jack is on the top, not the rim. I guess all wiring needs to be fished through the pickup route. I think I've seen this guitar previously. I would request a view of the serial number. Still, I think 5K is a bit pricey.
I think Pressure's Millie DC is access panel free.