The drywall needs to be as thick as the original drywall on the wall.
Building a hidden door in drywall.
Keep the trim so you can reverse the process if desired at a later date.
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Cut a piece of baseboard to that length making a 45 degree miter cut along the end covering the wide gap between the door and jamb.
Glue the piece of interior wall paneling over the drywall making sure any patterns match those already on the wall.
Measure from the adjacent baseboard to the edge of the door.
Open the secret door and use superglue on the exposed edges of the drywall to stop any crumbling.
First remove all the trim boards if any from around the door to the space you want for your secret room.
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Select the plywood waste and cut a piece 2 x the length of the door panel for the door extension brace select the 2 brace.
The miter faces the gap.
That leaves a smooth wall so whatever you put in front of the opening will sit tightly against it.
Apply wood glue to the back of the piece and tack it in place as shown with a pneumatic brad gun and 18 gauge brads.
Done properly there should only be a small outline of the door with a 1 2 inch missing from the bottom.
Using glue and 1 1 4 screws counter sink the screws attach the brace to the back side of the door panel 6 from the pivot edge as shown above.