Sorry...I think I should have clarified that I'm not using the .iso file you provided, but starting from scratch on a clean Pi 3 B+ with the full Stretch release on a 32gb SD. The instructions I've been reading for installing HA-Bridge have been confusing to me simply because I'm not familiar with the Raspberry/Linux environment...yet.
I first started with the Pi Zero W but could not get HG sending PLC reliably, even though the Pi is just 6 feet from the wireless AP. I like having the hard-wire network port on the 3 and it is much more robust...and just as reliable as the PC system I've had running X10 for many years.
I've been reading all I can find and am just getting a little overwhelmed, I think, in trying to learn an entirely new (for me) OS. I made my post late last night letting my frustration get the better of me. I should have just gone to sleep!
I've been finding some Youtube videos that might help me, so will keep plodding along!
I guess I was looking to see if any other users might be taking the approach I am. The work you've done is amazing and all that holds the promise of keeping our X10 modules working and relevant for many more years! The last piece for me now is getting HAB installed and working with Alexa. (You made that so easy with Alex10!!)
Thank you!