Looking at: C:\Win7PE\Temp\Win7PESE\HostOSTools\1HostOSCopy.cmd
Probably would be easier to just pop the .wim open as mounted and paste them in, but myeh. Looking to just interrupt the process as is without damaging it.
After an initial building, you can add files/folders in Target directoryor make changes in the registry (Regedit script in Utils folder).Then use the button "Create new Target Image and ISO" to simply recreate boot.wim and a new Iso.
Besides, a little quiet and slow response did me well. "I am thankful for all those who said no to me. Its' because of them, I did it myself" - Albert Einstein.