For what it's worth, here is my experience so far: I followed the OP's guide in the very first post to the letter. Some of my BIOS options (2 or 3) were named slightly differently but in terms of matching them as closely as I could, that wasn't an issue.
Then I started to install the OS after booting. It survived to the installer without any issues, I formatted my SSD to macOS (Journaled, etc) and now it's at 12 minutes remaining according to the installer. So far, so good.
*** Time passes *** *** More time passes *** Okay, so here's where I am now:
I've done the initial install (took longer than 12 minutes but that's okay) and rebooted off of the SSD.
I'm walking through the setup, and there's something I was VERY surprised by - I have an atheros internal mini PCI-E wifi card on this machine since I don't have any ethernet ports nearby. It just WORKED. It didn't want to connect at first, though it was able to see all of the wifi connections. Just hitting next allowed it to connect. (Note - I realized this only after the fact - I have a router that sits between my Korg Kronos and my Computer for FTP file transfers. The computer was detecting this connection and trying to connect on ethernet FIRST and only then would it look at wifi. As soon as I turned off my ethernet, wifi became the priority and was working perfectly. I need to update the priority on this later but that explains why it was failing initially) I'm walking through the rest of the installer right now, I'm surprised as much is working on this already. Nice.
Okay, I also have firewire on a PCI-E card and it seemed to detect that too for my external audio interface. Brilliant.
The only thing not working initially it seems like is the graphics though I haven't installed my audio interface yet. They're showing 1024x768 for now, but I'm hoping that an update or something I can tweak in clover will fix that. I haven't messed with it too much as of yet. I have a 144hz monitor, we'll see if I can get that working as well. I'm not sure if Mac even supports that, but it's probably worth looking into after the updates.
I'm upgrading to 10.12.6, and going to see if there's anything there that'll help. Again, haven't even looked at Clover just yet, I'll see what happens.
*** Updated, rebooted ***
Well then. I guess I forgot to make the drive bootable... It just sits at "Attempting Boot from Hard Drive".
I'll fix that and come back.