ACCURATE FOLDING TRY...!!

The folding,the buckles,the zips,the check-works had to be detailed exact..When you observe this picture carefully you could find out varied check boxes, though they are similar, due to the folding ;they differ in every point......

This drawing was quite challenging for its complex detailing!!!
Pencils used: 2B,4B,8B
Sheet: A3 size
A still life drawing piece....

AND THIS IS THE OBJECT:
(Sorry for the less clarity)