thanks it's a fun project, but it is my first electronics project and I am learning as I go along. Like anything, it's a lot easier having a good support network and access to the right tools and resources. Once I finish mounting all of the boards to the base plate, I will start to machine the front and back panels, and then I'll work on the wiring and hopefully should be done within 2-4 weeks.
I still haven't ordered the remaining electronic parts from Digikey, and it is a bit overwhelming because there are so many product options. For power distribution, I'm tentatively planning to use a min-DIN rail terminal block for power connections at the recommendation of a work colleague. It looks like this will cost ~$50 in parts but will look very professional and should be safe. Phoenix Contact
I want to add a remote trigger to turn the amps on, coupling the 12V remote trigger output from the 7702 to a standby/enable pin on each PCB. The PCB pin is normally hot at +5V, and the amp will be put into mute/standby if this signal is pulled to ground. So I think that means that I can gang together all of these signals onto a bus and connect them to a normally closed 12V relay. That way when the 7702 is off, the 5V standby pin will be pulled to ground and disable the amps and allow them to all turn on when the relay gets a 12V signal. I'm still working through this part and any suggestions are appreciated.
I want to add something to the front panel, and at this point I'm planning to have a single indicator button with a LED backlight. Digikey has a switch like this for ~$12, but they're only rated for 3A so I will probably wire it to the remote trigger circuit. E-Switch
I picked up a couple extra XLRs to see if I could fit my MiniDSP 2x4 into the housing, as well as possibly adding a 12V switch mode supply so I can eliminate 3-4 12V transformer plugs from the wall. It looks like there's plenty of space to fit these but I will need to confirm once all of the boards are in...