Opened a new thread. You can find updates about my custom builds here.
@arcardinal : Currently can't compile SlimLP due to a problem with file_contexts.
It stops at: .../out/target/product/d802/obj/ETC/file_contexts_intermediats/file_contexts: Multiple different specifications for /sys/devices/virtual/graphics/fb0/rgb ...
Error loading context file and so on.
I guess it is due to this change: https://review.slimroms.org/#/c/8957.../file_contexts
Removing the line (regarding the graphics device fb0/rgb) in "device/lge/g2-common/sepolicy/file_contexts" seems to fix the problem.