the frame is thicker and therefore the wood also fits on top of each other if your frame is thinner, you can also leave out the glass
red is cut
blue is score
the hearts are specially lasered
you can vary them as you like
paint everything the way you like it
I used acrylic pencils
with the envelope, the score lines may disappear slightly
you can redraw them with color
stick the envelope on the back of the frame
then the hearts
reassemble the frame
if the frame is not thick enough there might not be enough space in the frame
in this case i would leave out the glass in the front and then it should fit