Maybe this is obvious, but I've not seen this in the thread. For a single backplane dual diaphragm K67 style capsule (at some point I'll save up my pennies for a Peluso, or maybe look at the RK87 when it comes out, but I can only live so far outside my means...) is the backplane connected on the PCB to front body, rear body, or both? Both doesn't seem to make sense, and tracing the schematic it doesn't seem to matter, but I thought I'd ask anyway.
I'm tentatively planning on putting this in a MXL 2010 which has all the switches, and I have a two sided 34mm 67 style capsule on order.