it's kind of a long story, but the original plan was for this album/project to involve THE WHOLE BAND, but other than Andrew Futral, most of the members have had other things going on, so much so, it sort of became an Andrew Futral solo release.
I think they got a bit ahead of themselves in trying to make 3 albums at once. That's why it's taken nearly 4 years to finish.
Andrew's other gig, Field Mouse (which is the main project of Rachel Browne), has become more successful, and so he's at least had that to do.
But in doing this big concept, I believe the other members of The Age of Rockets were going to be available to make it, and it turned out, they weren't. Bess Rogers for example has been in Ingrid Michaelson's touring band the last few years.