I have the Dell 3020 SFF, which I got refurbished at Microcenter for $279. This guide works with no issues at all... sleep/wake works, Kensington USB3 dock works for a second monitor, ethernet, sound, iMessage, etc. All works with Mojave. Tried upgrading to Catalina from the App store upgrade, which basically worked fine with no other steps. The only thing that didn't work with Catalina was sleep/wake. So I re-installed Mojave.
Used clover configurator on the hackintosh to mount and install the EFI Clover files in the EFI clover folder on the hackintosh hdd per step 2.
Thanks for the detail and files.