Monsieur_Caillou have you noticed any issues using gtk3_nocsd
...love it though.
I think you forgot to share some i3blocks scripts coz its pointing to /usr/lib64/libexec//i3blocks/$BLOCK_NAME
.
people love your rice so share those.
my suggestion is move those scripts to ~/.config/i3/i3blocks/
and change path ini3blocks.conf