Ok, now your suspicion is mixing two different issues - bling and expensive manufacture quality ...
Anyway, I firmly believe that the boards and power transformer of the Momentum assembled in a different case would sound different. The same way a Jadis wired point to point sounds better than the same Jadis fitted with a PCB.
I'm not saying the case material and design don't have anything to do with the ultimate SQ. I am saying that the 'bling' of the amps design doesn't. For example, the pocket watch style meter, the copper heatsinks etc.,
But lets agree that I understand that you need to disagree with me on all my points, it's just who you are...isn't that right.