The difference between die template sizes within a Nestabilities set is ½?, which becomes a ¼? border when layering.
Approximate Die Template Sizes:
1: 1?" x 1½"
2: 1½ x 2"
3: 2 x 2½"
4: 2? x 3"
5:: 2? x 3?"
6: 3? x 4¼"