This is basically a video to promote reading. But what should you read?
Make sure you have a copy of Calamares that you can “git pull” from time to time.
git clone https://github.com/calamares/calamares
Then we show you in the video which files and folders matter?
Compare with ArcoLinux githubs.
Compare with Carli githubs.
Compare with ALCI githubs.
That is the summary of makes all of our isos.
Then you keep experimenting.
Change one thing and build the iso and see what happens.
Babysteps is a better way than changing it all at once.