I'm going as fast as I can find the time. I finished the back panel yesterday (see pictures below), and will be mounting the NCC300 modules on the heatsinks next. If I can get that done today, then I may start adding components to the base mounting plate.
I hadn't planned on it. What's the benefit?
That switch is not to turn it on. It's to toggle between the IEC and PowerCON power connectors. There will be a separate latching pushbutton switch (with LED) in the front panel.
Here's the back panel work from yesterday. With this particular enclosure, I decided to try using the pre-drilled mounting plate, so I decided that I could go with the cheaper steel panels rather than the 3mm aluminum that I usually use. It drills fine, but the jigsaw makes a mess of the square holes. (That's another reason why I like the Neutrik connectors, as they can be done really cleanly and consistently with a punch.)
The extra four holes on each side are to mount the speaker protection module.