I wish to make a simple laminate storage box W1230mm x D380mm x H780mm with a lid
Welcome to the Bunnings Workshop community @StephenBott. It's wonderful that you've joined us, and many thanks for sharing your plans.
That sounds like a reasonably simple project as you could have all the laminate cut for you in-store.
The materials you'll need are:
Please let us know if you have any questions about how to assemble the box.
Mitchell