I looked at my Dual 500 today and I know this would be a great task to make a PCB back plane. Still debating on that. I see ferret beads, I believe this is to suppress parasitic oscillations and no wonder with how this amp (along with the rest of Phase Linear amps) is wired. No disrespect, I love PL, I have had them since 1978. They know what they are doing, just I think they could have done a better job wiring these amps.
If I did a PCB back plane, I would definitely do a double sided clad board. I believe this would eliminate the need for the ferrite beads.
Again, all this is preliminary and it is almost daunting to me. So I may not go that route. Just looking into preliminary and what I want to do.
Also, I will separate the inputs / power from the rest of the wiring as I do not believe in grouping these things together (power etc.)