Hi @Tracyjj,
Thank you for your question and welcome to the Bunnings Workshop community, it is fantastic to have you with us.
You'd essentially be making a picture frame, so it is definitely worth having a read through How To Make a D.I.Y. Picture Frame.
This question has been asked a few times over the years, so it might be worth having a read-through the following discussions -
My colleagues have provided all the information you'll need to create a custom frame for your canvas, but if there are any parts you don't understand or need some clarification on, please don't hesitate to reach out. I am more than happy to assist.
Jacob
