As I play with my prototype, I'm making a note of mechanical issues I will need to fix next time.

• The scrolling board tends to "ride up" or "ride down" over time. I need a way to gently guide it to stay straight and centered.
• This version 0.1 prototype is rather large in thickness (dimension perpendicular to the wall); also I would like the plotter on the "hidden" side in the next prototype. So that if you put a frame around it, it just looks like a thick picture frame and not like a scroll. 
• This particular contact paper doesn't erase well. I have found some other stuff that will erase better. In addition it's kind of curling at the edges so next time I will need something thicker. But now I realize that perhaps the scroll can be transparent, running over a colored board underneath it. The text will be written on the dry-erase transparent scroll and the background will be visible through it. I think it will be easy to find inexpensive transparent flexible scroll material but will need to look for something specific.