Hi, Kristian,
If you are cutting this from material about 3/8" to 3/4" (about 9.5mm to 19 mm I think) , you would just cut out the 3 areas in the center that would fall out and leave the entertwined squares.
If you want to cut it from thin material as a portrait, you would have to make
'bridges' between the areas that would fall out and the adjoining wood on the outside
of the pattern.
Good luck and God Bless! Spirithorse