Rear quarter panels inside the boot are longer on the estate than the hatchback, so it wouldn't be a case of just installing estate parts into the hatch. You wouldn't get away with the hatchback side trims as you need the mounts for the locking catches to keep the blind shut that only the estate has, I'll try to grab a pic of the side trim on the estate for you
EDIT: First pic of the hatch, others of the estate, as you can see they are totally differrent