Pattern honeycomb structure

Dear all,

I'm trying to make a part who's exterior will have a smooth surface, the inside will have a honeycomb structure.

I have extruded the outside trough numerous features and finaly used a shell feature to cutaway the unwanted material. Now I would like to pattern a honeycomb extrusion along the entire inside of the model.

What is the best way to do this?

SolidworksParts And Features