26 layers and 9k+ parts? Christ, who even does that in Altium? I'm amazed it even loaded in the PCB editor.
That kind of a board is solidly in the Cadence Allegro/Mentor Xpedition territory. The cost of a prototyping revision or two for something like that is going to cost at least the price of a seat of Cadence or Mentor, and those are expensive packages.