Personally, I like the idea of Funtoo having an installer. Nevertheless, I understand the fact that investing time into writing and maintaining an installer for a rolling release distro such as Funtoo might not be that high in priority. If we were to consider this I would suggest looking at a simpler installer something like Archlinux install script or OpenBSD Installer. Nothing too fancy, simple question and answer text based installer. Saying that the online instructions for installing Funtoo have never failed me, although they look a bit scary for a beginner who just wants to copy and paste