Here is what the internals looks like with the built modules installed.
In order go around clockwise from top right....
1. The mike rework is in place (sticker on the case). This I added as I did not have the mike they said they were using. Remove the side panel on right (one with sticker on) and you will see the jumpers in place.
2.The K2 DSP/realtime clock module. The 3V coin battery was dead so added a new one.
3. The 60 transverter module.
4. The 160m 2nd RX antenna
5. Noise blanker
6. SSB module
You will see the KIO2 board as well, not the speaker has the extra shielding as was to be used with the 100W PA until that was relocated to a second EC2.
Short video showing the KIO2 with a usb to serial interface with a cable I made up and win-test just changing band and mode.
The ATU/100W module in the second part.