Greg,
The video is great. Thanks for sharing that.
On the intercom I thought I would mention a somewhat odd thing I have on my system which is a Tone Commander FL2000 flashing light adapter. It was discussed in this thread: https://sundance-communications.com/forum/ubbthreads.php/topics/571611/2
Long story short it works with the station intercom to flash the intercom line light at ring cadence on the called station only. All other stations show a steady "in use" line light.
As all the guys pointed out in my original thread it was a lot of extra hassle and expense (and individual line 5 light wires) to make it work and was definitely a fancy "nice to have" feature and uncommon. But I thought it was kinda neato and unusual but it was a pain in the rear to implement in my system.
However after seeing your topology it seems you could probably implement it fairly easily. That is if you were super bored and wanted a totally useless but interesting feature.
Here is what it looks like in operation:
Shawn