I was thinking about this the other day, about who MP would get to play, and I have to wonder - will the band be ONE band, or will they have multiple players swap about? For instance, he could get one guitarist for the show whole, or perhaps they trade off between songs? Then I started thinking about which guitarists MP could get, and Eric Gillette came to mind, with his JP-inspired sounds, but there's also Paul Gilbert, who has played with MP on various live shows to cover other bands (which this is basically a cover band), but there's also Tony MacAlpine from MP's PSMS project.
I figure MP might try and get Derek, though does Derek have the chops and sounds to keep up with Jordan's parts for those songs? I haven't heard Derek play in some years, so I'm not sure what he's up to.
As for bassists, MP knows a SLEW of them, all really good, so I'm not that concerned on that end.
My BIGGEST concern is who he'll get to sing, and this is where I wouldn't mind having multiple vocalists. Maybe one for each song, or perhaps, one for each of the 12 movements/steps of the suite? That would be interesting, since each movement has vocals in them.