A lot of cases are over date , but the principle how to make a case , is the same.  
So with a little bit from All Stohlman and a lot of yourself , you can make the case you want. 
I use the books , to learn the principles , to learn how to work with the leather  and the tools. 
Why shoot I try to find it  out by my self , if somebody else took the the time to write it down and I can use it .  
Even if I should find a book out of the middleages and I can use it , I'm happy with the experience of someone else and use it.