Welcome to the Bunnings Workshop community @Craig_Ebing. It's fabulous to have you join us, and many thanks for your question about building a pallet bar counter.
I'd recommend you have a read through How to build a pallet bar which will give you a basic idea of how to construct a unit. Since you are after a relatively simple design, you might like to create some plans yourself. Depending on how budget you want the build to be, you might need to compromise on how the bar is constructed. If you're planning to use pallet wood, then you'll need to work with what you can get a hold of. Many of our Bunnings stores will leave scrap Pine pallets out for customers to collect. These could be a good source of timber for your project.