Here is one project posted. https://www.hometalk.com/36965734/how-to-make-a-barn-door
Here is a tutorial https://www.hometalk.com/28833934/diy-barndoor-tutorial
Here's a tutorial you might find helpful.
this pin will show you how to do it on the budget https://www.pinterest.com/pin/272749321169059397/
here is the very simple barn door we built - https://www.charlestoncrafted.com/how-to-build-a-rustic-barn-door/