Sorry but it doesn't work that way. The squashfs is a image of the root tree of a preinstalled kali, not a container for multiple packages. Also, we are based on Debian, but that doesn't mean Kali is Debian + some tools. We do modifications in packages that come from Debian that Debian doesn't have

Thanks for response,
Should have added more, I understand its not debian, expanding my previous note,

1. live/10.kali.base.squashfs --> base install (without any pen testing tools).
2. live/20.kali.penttestbase.squashfs --> all tools that comes in 4gb iso dvd.
   (1+2 == standard iso DVD)
3. live/30.kali.penttestextended.squashfs --> all other tools that comes in 11gb full iso dvd.

I also understand build process if kernel is customized, along with other booting process and efforts involved.
I am not re-requesting/opening, but only clarifying some bits.

(considering it closed, unless otherwise)
Thanks again.

Sorry again but packages don't work that way. We can't separate them in multiple squashfs like in layers. Multiple packages do modifications (and configurations) to other files after installation. Having the packages separated that way would require an extra step for the installation process, and for that we already have the installer image