Hi,
I know this is a bit old, but I found it when I was searching for an answer to the following question:

I have prepared USB bootable image based in WinPE. I use it to boot from USB. I have this image in iso file and I use it to place it on USB with rufus software.

I wonder if I can use this tutorial of yours in exactly same way only to use my custom iso image instead of your mentioned WinPE.

I know this may be trivial question and I may just try it, but I am really only beginner in WinPE and fog project.

Thank you for your kind answer.
-r-