I'm new here and looking forward to being part of these discussions. Part of the design is why the customer wants a mantrap? Is it to limit RF transmissins or to make sure the person entering goes through a metal detector? Maybe just to keep prying eyes out? Is there a requirement for only one person to go through at a time or are multiples okay, maybe you could apply a two man rule? Is there a sound requirement to meet? Maybe you dont need three doors? I have had good success with two doors almost everywhere but have had to use three for sound. I use a simple brick type PLC to do this but I used to do it with DPDT door switches and some Altronix relays. I have used the maglock/strike combo and the AHJ had no issues with it. I usually put a mechanical over-ride keyswitch tied to an audible/notification alarm inside the space to allow emergency personnel access. This precludes the bad guys from hitting the F/A and getting access while allowing free egress on a F/A. The ingress is controlled by people in the space. Some AHJ's will insist on the doors opening on F/A and will not bend, some allow an over-ride keyswitch and others say egress is all that is needed. Just some thoughts, hope they help.