Thanks to all the developers that have made this happen.

My system:

    Asrock x570 Creator
    Ryzen 9 3900
    Radeon Pro W5700
    2 x 32gb DDR4-3200 ECC
    2 x NVME drives

Kexts:

    AMDRyzenCPUPowerManagement.kext
    AppleALC.kext
    AppleMCEReporterDisabler.kext
    HibernationFixup.kext
    Lilu.kext
    MacProMemoryNotificationDisabler.kext
    NVMeFix.kext
    RadeonBoost.kext
    RealtekRTL8111.kext
    SMCAMDProcessor.kext
    SmallTreeIntel82576.kext
    USBPorts-X570-ASRock-CR-Int_BT.kext
    USBPorts-X570-ASRock-CR-PCIe_BT.kext
    VirtualSMC.kext
    WhateverGreen.kext
    itlwmx.kext

What works:

    Audio
    Wifi
    GFX
    Storage
    USB
    10gbe and 1gbe

What doesn't work:

    Sleep
    Thunderbolt 3

What hasn't been tested:

    Bluetooth

Notes:

    I had to use iMacPro1,1, MacPro7,1 does not work
    I had to add agdpmod=pikera to bootargs for my GFX card (Navi 10)
    I successfully chainloaded the opencore efi to my grub so now I can triple boot windows, linux, mac
    I basically took iGPU's github and updated it and included my own DSDT.aml and serials
    I created an offline installer from a virtual machine to install it
    I haven't tested without RadeonBoost, but performance seems to be on par with Windows in WoW
    I installed directly from 10.15.6, it wasn't an upgrade