Don't buy Nvidia, Apple stopped supporting their cards since Mojave. Get a supported Radeon, it should work out of the box.
Have you disabled "debug" option in Clover configurator? My boot was super long, and after disabling it it's like 15 seconds.
I have updated the build. Replaced GTX 960 with ASUS RX 580. Working great out of the box, without any kexts! Also got the Bluetooth working properly.
@ski4evr - it just would freeze when sleeping, I had to reset the machine if it did sleep.