Thank you so much for your guide
@rj510 !!! Was a great help for a fresh install! Everything is up and running and works brilliantly, even Handoff, AirDrop and iMessages. I might add that I used a different wifi card than the one you suggested; a Broadcom BCM94360CS2 with a NGFF M.2 Adapter Card Module as well as a Power Color Vega 56 Red Dragon GPU.
Card (eBay link) ››
Adapter (eBay link) ››
The only issue I have run into is that there's seems to be some sort of loudness protection when using the "Internal speakers" setting which is routed to the front panel of my case, Fractal Design Define Nano S. When listening to a podcast, or any audio where there's speech with highs and lows, the audio "clips" at loud parts and briefly decreases the volume. I can use the headphone output on the back or through my display to make it work, but the front panel output is really conveniently placed and would be my source of choice if this wasn't an issue.
Anyone else run into this problem?