I was testing out if there were issues with the source and build an unofficial Oreo build for FP2. It is here in case any one is interested in testing it out.
For those interested in building /e/ ROM’s using the Docker method : The build instructions are here
For those interested in building /e/ ROM’s without using the Docker method and through the traditional method you will will find an excellent script here
Want to build for a device without LOS support we have an article here
All the best !!!