When looking at laser cut flat packed terrain, I assume it's as simple as ordering one, scanning the individual sheets and then using those images as a guide for any CAD drawing. Could be very quick and easy indeed.
Also, they are using the beauty pics straight off the 4Ground website, but when reading the Engrish description, it states that the product is unpainted plywood, which already is quite different from the originals. The fact that there's no pictures of the actual product is telling enough, I gather...