Have Sierra on 1 SSD, installing Mojave on another - some issues

I talk about some of this in this thread:


but wanted to create separate thread, since the RX480 question is already squared away in that thread.

Here is my situation: I have existing Sierra setup. I use a USB drive for boot, then start Sierra from its SSD.

For my Mojave install, I have separate SSD I want to use for Mojave. I created the Unibeast USB per the instructions...

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Author: bhuether