There are 2 repositories under gentoo-installer topic.
Automated modular GENTOO linux setup
Dockerfile to bootstrap a pristine, minimal and optimized gentoo image
gendeploy is a Gentoo installation script with an installation wizard, automated deployer, and a personality. Currently unfinished.
Some Gentoo Linux Install Scripts to ease the process of installing Gentoo
GentooDAD - The Gentoo Install Solution
made by: wncry