Yes it was very simple. I made the box type oven. I used a few sturdy cardboard boxes. Lined the inside with foil, covered the outside with black tape (although non toxic paint is good, I just didn't have any on hand). Made 2 smaller boxes lined with foil, to fit inside the oven, and a lid. I am on the hunt for the right size piece of glass to set on top while cooking (I used plastic wrap and just wasn't happy with that).