Not about the op but I've always hated the name "mockup". Maybe it because it seems less technical than other terms used in the design process such as wireframe and prototype. I also dislike the way the word sounds. I often use alternatives like sketch or draft since they describe an output that is usually fairly short in the time frame of construction and open to future change. I hate the name mockup so much I think I may have opted to honestly not use the app Sketch if they had named themselves Mockup.