I’m documenting the basics here in case others wish to use ideas from it. Most of those ideas of course came from others who have done similar projects; can’t name you all, but thank you.
So my integration seems to have centered on a cheap 7" android tablet. It started there hoping to use bluetooth as a virtual presence sensor/detector for multiple devices (phones, pod, etc). That works, but not consistently. Will devote more energy to that in the future. But I also imagined using its camera and screen, and those things are shaping up nicely.
In particular, the camera. I’m using IP Webcam Pro to capture 15 seconds of video any time there is motion, and the motion sensor output from that program is also triggering, via the Secure Settings plugin for Tasker, screen wake up on the android tablet.
Right now I’m using Sharptools widgets as my control panel. Might eventually migrate to Smarttiles or something, but for now this is working.
Additionally I’m using OK Google for voice command, with the tablet always listening. Aside from occasionally having to retrain the OK Google phrase, that works very well. It turns lights on/off, locks and unlocks my front door, etc.
I also have Tasker, via AutoNotifications, using tablet notifications to trigger all sorts of things. It sends emails to notify of events, it turns on lights when certain friends call ahead, it can also unlock my door that way, etc.
Will add to this thread as I progress.