ok  fine  
but i think its better to  do with photo step by step the easy model  
i mean the classic stuff , any way in general inside the wallet you have tow thing  
cards place  and frame or  ID place ( some times you dont need ID ) thats mean you have tow places for  cards   
first you need to form the pockets for cards then fix them in the ( inside  leather )  
the pockets could be vertical or horezental , vertical  is more easy  for you  
here is drowing with sizes 
this  sizes can be adjested accourdingly  to fit your corrency  
this wallet drowing  contain three layers  
if you want tow only the outer one should  be 0.5 cm   more in weidth  
(((( sory for my poor english  ok  )))))) 
 in lingth the deffrences are important cos when you bendt the wallet with some paper mony inside it should bend  nice and easy not sqwees  
to be contenue