So here is the final product...

However, I took it one step farther and made it PORTABLE! I mounted each layer on foam core, so I could take it apart.

Supa cool! And the teachers loved it! I would say 90% of it is usable, I had to hot glue two of the notebooks to keep it from sliding around. I just made it up as I went, so here is how I layered it together...
Layer one: rectangle kleenex boxes, surround with glue bottles & sticks.
Layer two: notebooks stacked (tied together with fishing line), surround with post-its.
Layer three (second tier): Four square kleenex boxes glued to foam core, pencil fence (hot glued the pencils to pieces of cardboard), hot glued erasers on top. The cardboard fences were glued to the kleenex boxes with XL glue dots, ribbon helped keep it in place.
Layer four (third tier): one kleenex box, surround with antibacterial & dry erase markers. I hot glued all of this down.
Lastly: A plastic cup glued to foam core to just set on top.
I also used my silhouette to cut out the letters. I actually had my 6 year old help glue stuff on. It was fun to work on it together.