You're quite welcome, Chasseur.

Books on the accessories themselves are few and far between. Most of my "books" are ring binders full of sketches and dimensions I've put together over many years.

If you like flintlock and percussion guns and accessories, W. Keith Neal and David Back published "British Gunmakers; Their Trade Cards, Cases and Equipment". Their are a lot of accessories and cased sets, but the pictures unfortunately are quite small.

"Gun Tools, Their History and Identification Vol.2" by R. Stephen Dorsey and James B. Schaffer also have some British case tools.
I have not been able to find Volume 1, so I don't know what's in there.

Mr. Collis' website has by far the best collection of good quality pictures.