Hello, I'm very impressed by your project and I'm very much willing to invest in your products.
However, right now, I'm using a 40 year old amplifier that I'm very much willing to change.
But currently there is no cases offered that support all three, the Pi4, DAC2 HD and AAmp 60. And my partner will definitely not be pleased with electrical boards showing in our living room (As i plan to use the wifi and bluetooth funcitonalities on the pi).
I hope you consider making such an option.