Step 2: Remove the center of the box
Step 4: Cut fabric to fit
cut around the chalk leaving a little seam allowance.
do this twice, once for the exterior and once for the lining.
Step 5: Sew the H together
Turn the piece inside out and then top stitch all the way around, except for the opening you left.
Step 6: Put the cardboard inside
reach in there and unfold the box flap by flap until it is all flat laying inside the H