Hi there!
I did not initiate the assembly of this ISO, as well as do not advertise it. It was just a one-time job: to assemble the ISO of these packages:
busybox gettext-base glibc-base libtaz slitaz-base-files slitaz-boot-scripts tazpkg tazusb udev
First I would like to say that this is impossible. Assemble, of course, possible, but it is not going to work. In reality, there are two packages more. ISO image contains "linux" (Linux Kernel) and "syslinux" (boot loader) outside the rootfs.gz. Of course, you realize that nothing would have happened without the kernel and without the boot loader.
I booted from this image, and it works. I can typing in console different commands, such as "whoami" and "date"...
All the matter dependencies. More precisely, of their correctness. If the dependencies are correctly registered in the packages, then you can install the one "firefox" package in rootfs and get the environment that contains everything necessary for it's work.
On the other hand, dependencies may be excessed. For example, "busybox" dependencies:
slitaz-base-files glibc-base ncurses-common
But it works without "ncurses-common". I think, "ncurses-common" is for ncurses-based applications only, but this ISO such a small that it not contained no one of them. And the size of "ncurses-common" is small that then you do not want to argue. Just for fun, you can try to collect your minimal system and learn, without which it will work. In the above topic, I described the steps as possible to collect image of your hand.
There is a special tool to build images, tazlito, but I know him very badly yet. A simple one-time job easier to do manually.