I try to make an effort to occassionally go through the Gentoo Build Publisher Install Guide to make sure it is up to date, but I don't always get to it between major changes. Recently it came to my attention that the Install Guide was not working as expected. I've since made a few changes, including the release of gbpcli 2.1.1. If you've had issues installing Gentoo Build Publisher in the past, give it another try.
As always feel free to contact me should you have any questions or concerns using or installing Gentoo Build Publisher.
While we're on the subject of GBP installs, I am in the process of creating a Docker Compose for Gentoo Build Publisher. This should significantly ease the installation process. Stay tuned.