Thanks Warren!
I did what you said successfully!
Now that I’m able to view the edit via BD there arise more questions:
1) What is the maximum bit rate permissible for BD playback? My test was the default 18. Some of the slow motion in my edit looked choppy. I understand that the cause is likely in the edit but I want to try other things before going back and adjusting in Final Cut.
2) Is my authoring software re-encoding despite my earlier step of exporting from FCP timeline via Compressor with BluRay settings(m2v)?
It took a long time to create that .iso file in DVD Architect.
I think I have a lot of experimenting to do.