They look brilliant, many thanks for sharing @peta.
We recently had a couple of new members ask for assistance with their barn door builds. Perhaps you and your husband might be able to assist in the discussion with @neilmacgregor and @KellyG here? - https://www.workshop.com.au/t5/Whole-of-House/Internal-barn-door-build/m-p/17926
Let me also extend a very warm welcome to the Workshop community. It's fantastic to have you join us. I trust that you will receive lots of inspiration and helpful advice for your projects from our community members. Feel free to post whenever you need a hand or have a new project to share.
Visitors to this very popular project might be interested in this article from Bunnings about how to add barn doors to your home - https://www.bunnings.com.au/diy-advice/latest-in-our-range/barn-style-sliding-doors-how-and-why-to-g...
Hope you find it useful. Please let us know if we can give you a hand with your project.
Welcome to Workshop and my apologies for the slow reply while I was absent.
Bunnings certainly sells the barn door track hardware kits. Here is an example - https://www.bunnings.com.au/lockwood-2m-outland-barn-door-track-hardware-kit_p3980052
You also might find this article about barn doors helpful - https://www.bunnings.com.au/diy-advice/latest-in-our-range/barn-style-sliding-doors-how-and-why-to-g...
Please let us know how if you need a hand with anything else.