Some pics of the av switcher boards being installed into a plastic rack box along with the pic interface board that I made................
Top left pic shows the two av boards piggy backed on top of one another .........

Top right pic shows same from different angle

Bottom left shows the front of the box with 3 leds ..top led ..power led ...middle led ...alive led..
Bottom led..valid data received led............

Bottom right pic shows the rear of the box....bottom 2 rows of sockets are the audio zones ...the top 2 rows are the 16 video inputs..........
The db9 is for I/o interfacing to homevision..the 3.5mm socket is for the internal ir led and the 2.1mm socket is for the 12v dc power in.................