Step 5: glue
After all the openings have been made it's time to install the zipper. The easiest way I found was to glue down each edge and leaving the corners until last.
Glue one side at a time and allow the glue to cure between sides.
With the zipper closed, start by gluing down one end of the zipper to the inside edge of the book spine. The, progressively work around each side of the book and terminate the extra zipper length at the end inside the book spine. The extra length can be trimmed later.
Allow the glue to cure.
Unzip the zipper and repeat the gluing process for the other side of the book. Let epoxy glue cure overnight.
Once the epoxy has set it's time to deal with the inside corners. Create a pleat on each corner and apply epoxy, you may need to rest a weight on the corners to ensure they cure lying flat. I used a plastic grocery bag as a barrier between the wet epoxy and the weight I used, removing the plastic after about an hour allowing the glue to set without bonding to the plastic barrier.
Repeat for all corners on both sides.
Glue screen lifter
Scraps of fabric from the zip-up binder were used to create screen lifters inside the book. These lifters will allow the laptop screen to be opened when the book is opened, allowing ease of accessibility in one motion instead of two.
Scraps were dry fitted around top edge of laptop screen and checked to ensure operation both when the screen was open and closed. Epoxy glue was applied to straps and all glue was allowed to cure overnight.
Trim excess zipper if required.