@mboehmer
Any update on the Prometheus firmware upgrade? I take it that is the modification you reference??
Even assuming the Sonnet could not recognize the rest of the classic hardware; it would presumably work with the other pci cards on the bus. Therefore, this would make for an interesting bridge system, similar to putting one of those stand alone x86 cpu cards in one of the Amiga's ISA slots. The Sonnet+Prometheus would potentially anyway allow users to boot into their classics for nostalgia, etc. sake or choosing to boot from the Sonnet and into OS4.0+ (assuming some form of special UBoot was made for it).