As you would need larger than 12 x 12 card to create a bespoke box for your large finished books we have sourced our Latest product …Ready Cut Box Board Sheets 10 bases and 10 lids with finger cutouts for you to create 10 boxes. Simple score at 2.5cm all round your base and lid, crease, cut corners and glue. You can also score at 2cm all round as this creates a slightly larger box which is useful if you want to add lace around your book. You can also score at 3cm which gives you a slightly smaller box to accommodate one of the smaller size books. Truly a very useful partner for your books.