When planning a timber lined wall with a lined door opening, it is important to design the door opening or jamb to suit the lining board width. Porta Contours has a 78mm cover width, so say 10x board wide or 780mm door would be typical. Also the face of the door, jamb and surrounding wall needs to be at the same height to provide an even surface to adhere the lining board to. Simply working from the face of the door, progressively work from there to fix the location of the surrounding wall lining.