The case is based on some box making and bookbinding concepts. Once I had all the pieces cut out, the actual assembly was around 10 minutes. Very simple and very fast!
I gave the cover to my friend as a birthday present and she loves it! She especially likes it because it's more durable than most commercially made similar items like journals or handmade books.
The total cost was around $5 for materials. The Nori paste is a specialty item that I only used a very small percentage of, so that was a minimal addition.