The fatdog-iso-builder of the 17th Oct 2022, fixed all the previously presented problems. Now the base file is perfect!
However, using fd64-devx_813.sfs, when trying to compile the 5.19.16 kernel, it presented a new problem.
1- I downloaded the tarball from https://kernel.org/;
2- I unzipped it in an appropriate place, renamed it to linux, created a symbolic link in /usr/src/;
3- I created a folder with the name 5.19.16, I created a symbolic link in /lib/modules;
4- From the 5.19.14 kernel .config I created a .config for 5.19.16;
At the terminal:
1- # cd /usr/src/linux
2- # make -j2
I got a file not found error message at:
/usr/include/x86_64-linux-gnu/*(as per image-1)
/usr/lib/gcc/x86_64-linux-gnu/7.3.0/*(as per image-2)
I unzipped fd64-devx_813.sfs
It turns out that all these files already exist in /usr/include/
So I created the folder in /include/x86_64-linux-gnu, and copied the files (from image-1) into /x86_64-linux-gnu
What was missing in /usr/lib/ the "gcc" folder, is located in /usr/lib64/gcc/x86_64-linux-gnu/7.3.0/* which I copied to /usr/lib/
I could also do all this by creating symbolic links in their proper places.
After that was complete, I repackaged fd64-devx_813.sfs.
It turned out great, and I've already compiled the 5.10.148 and 5.10.149 LTS kernel and 5.19.16 kernel, with the new fd64-devx_813.sfs.