Hi Kong ,
Open work, dial of K3 is impressive with sunburst pattern , angry face ,3D moon phase underneath skeleton dial is impressive too . The design of them are contemporary , rough and daring, they look strong and pure . The case , especially the lugs seem do not follow that spirit , they are classic design , smooth with the curve . I think the case , lugs would be made more stronger ,and rough , or other option is : case should be made very thin to create the feeling that the dial spread whole the face .
Beside that , the stronger looking trap like carbon fiber strap (or leather with carbon fiber pattern  
should be more suitable than the croco leather .
Just my thought .