Picture of my Danby door. I cut out all of the components sticking out past the door, and used aluminum foil tape. Not too concerned about looks since few will see the inside. But I do have a plexi-glass liner that is screwed on. You just can't tell in this picture. And the original rubber liner fit right back into its seal, over the edge of the cut plexi-glass.
You could use chalkboard or whiteboard paint on the inside, so that whatever you do on the inside isn't an issue. I'll probably just throw stickers on the inside piece of the door instead.
Not a difficult job. Easy to cut with a good utility knife. Just wish I hadn't spent time trying to pry the plastic of the door off. I did end up resealing it where I did that.