Wow, very cool, really appreciate the detailed explanation. I'm very familiar with the RPi (running 2 to do dns/web services/perl script automation, etc.), used it since the original came out. Mine are version 2, so I might repurpose one for this. I haven't bought the Echo yet, been watching these threads, and am finally to the point with other projects I can spend some time on this.
Once again, thanks a bunch for consolidating this info here . . . It took you some time, and I appreciate it!!!
Paul