Forwarding, the construction of the book before decoration can and often does take time. So much effort that will never be seen. However the forwarding has to be as perfect as possible, any oddity or bump will only come to show later. Sewing to be consistent, edge decoration, end papers and end bands etc. The boards need to be attached with precision or the book will not stand. The spine to be secure yet flexible, so many things to do before one even touches leather.
Final sanding with back cornering, now to start finalising the design, to experiment with different elements. Let the fun begin.