Roy and I worked on this design for some months. Definitely a Classic 50's-like thing going on.
Top has a p-90's . The bottom has a single p-100.
Usually the tunings are D on the top and G on the bottom.
Over time he uses it more and more. Originally it was thought to be a novelty guitar-a one trick pony as it were.
But no, Roy has really made use of this thing both live and in the studio.

Proposed arch top design