After research I came up with the following design.
7×7 grid with 10mm gutters
16 margin spacing
One of the reason of choosing palatino is that I wanted to create age to the book. As this book was inspired by finding morris minors I decided to choose palatino because it was created in the same year – 1948 that the morris minor was created too. The greyish blue colour choice is also inpsired by the car.