Nearly everything you need is in the image folder.
But the WDM script file (*.rsp) is missing.
Easiest way to create this is to right click the device in WDM and select “Get Device Image”.
Now WDM creates the script for you. Go to Package Manager – Images and right click your package. Select “View Package script”, mark everything, copy&paste in Notepad and save in eg c:WDMblabla.rsp.
Copy the content of the image folder from your stick to a folder c:WDMblabla and ready you are.