Mirad lo que he sacado de blu-ray.com. Parece el fin de los steelbooks sin serigrafiar
Go to Google images, download suitable picture.
Print the picture.
Cut black backing paper to exact size of interior or Steel panels.
Stick picture to backing sheet using double sided tape.
Place backing sheet between Steel plate and plastic frame.
Press together.
Ensure that the picture is aligned with the internal frame.
Job done. No need to stick black backing paper to steel.
Meaning if you find a better artwork later you can simply change it.
Hope this helps.