To be able to build you install this package
Build your iso by running script 30 or 40 in the folder installation scripts.
Archiso will be installed if not present. Carli keys will be installed if not present. Carli mirrors will be installed if not present.
Do check out the archiso.readme. There may be a difference between archiso versions. That may lead to different results.
Use the correct version of archiso.
Start building your own carli version with the use of the scripts. Change the files - packages.x86_64 being the most important.