I finally did it! And just a little over 2 years after first seeing it. WHAT?! I've been busy!
I followed the step by step instructions on Raising Olives' rain gutter book shelves tutorial,  and with the help of my 14 year old son, it was super easy!
Here is photo with my 7 year old to show perspective on how low I put them on the wall, so little hands can easily reach.
My plan is for these to be used to house our library books so they won't be mixed up with the books on our bookshelves.