I just installed three multi-purpose room sound systems, the everyday system consist of a DSP processor with an automatic mixer for 6-channels, for larger events a portable rollaround mixer plugs into a multi pin screw-on snake. I had the 16 channel snake made by Conquest Audio USA with 18 XLR connectors for the mixer & the other end a 18-pin quick disconnect that connects to the DSP unit. On the wall is a quick disconnect plug for the multi-pin snake, we enclosed this connector in a flush mount locking wall enclosure to prevent tampering. The roll around mixer has a middle atlantic sequencer that turns on the main system. I would not make the multi-pin myself, I had it made, the wall plug I had made with a 18" pigtail with XLR-F, All cables are hidden in the wall. total cost was almost $800.00 for both the 75' multi-pin snake & wall plug. Wasn't cheap but works as design, fast connection & disconnect...most events runs off the automatic mixer in the DSP unit, when they need a sound operator & more channels, than the roll around comes into play...the church really loves this design & quick disconnect... good luck on your mission....