Here you can find the repo if you want to use it. The jist of it is that you configure the source code like you would dwm, or st and then you have a very fast and light fetch program. For the ascii it takes a file called conf found in $HOME/.config/cfetch/ so you can easily change the ascii output. The repo has two ascii files one for gentoo and one for openbsd by default, check it out, critisize it do whatever.
Fantastic
Configuration: re-write the app dumb-ass