Step 2: Installation and tweaking
Once the door was in place, I tested the opening many times and then secured the base with 4" screws.
The latch bolt was installed to the interior door frame matching the latch height. A fishing line was secured and run through the back of the door and connected to the secret book opener.
Hindsight note: Double or triple knot that fishing line or it might come off and your door is stuck closed.
The secret door opening book was a really nice touch supplied by my brother. I glued the pages together to make a solid area for attaching a small brass hinge and fishing line to pull open the latch.