Thanks for making this guide. It's the first current thing I've found on this site that is an informative mix of "do this" and "this is why you're doing it." As someone who has never once before booted non-Apple hardware with Mac OS, this is a huge huge help.
It's such a help that I was all set to go purchase the motherboard you are using so I could use your guide exactly as I definitely need an m-ATX board, but will probably use integrated graphics and an i5 processor with Sierra. But as I read on in the thread, I see there are still lots of small problems with the OS on the hardware.
Sleep doesn't bother me much because this machine will need to be on all the time running my home automation software.
There are lots of "ok now I've tried this" entries in the thread. Where are you all with this motherboard and Sierra now?