In part 8 of the die-line conversion tutorial, which is the final part for modeling and UV mapping, we apply thickness to the geometry and separate the inner and outer thickness components from the edge part.
For Part 1, go here.
For Part 2, go here.
For Part 3, go here.
For Part 4, go here.
For Part 5, go here.
For Part 6, go here.
For Part 7, go here.
For Part 9, go here.