I have made a sample concertina book with an recessed cover. The front cover was made by glueing two 1mm grey boards together. The top board had a square cut out to create the recess. The back board was made in the usual way with 2mm board. Both boards were covered with book cloth. I placed a wood engraved print into the recess.
I am using the concertina book to record the Dovecote Gardens through four seasons. The first drawing is a panoramic view of the garden as it is now in May.
I plan to repeat the drawing each season, continuing the panoramic view along the length of the book.