How is the wooden pond in your pictures constructed please?
Welcome to the Bunnings Workshop community @Murdoch2552. It's a pleasure to have you join us, and many thanks for your question.
Was it this Pond with built-in seating that you were referring to? If so, the talented @Adam_W has provided a detailed video in that discussion on how to build the pond. Just click the blue link, and you'll be taken there.
Please let me know if it was a different timber pond, and I'll point you in the right direction.
Mitchell