Solar powered iPhone charger and Arduino in a book

  This project is ongoing, but it works well as is and I learned a lot from making it.  It has taken about 7 months to build, little by little, as I acquired knowledge and parts.  I was originally inspired by Honus' Mighty Minty Boost, so thanks to him.   In case some of you are wondering, yes, some of the close-up pictures were taken with my iPhone magnifying camera mod.
   This started as a solar powered 3v/5v power supply and phone charger in a book.  It turned into an evolving and continuously expanding project.  It has a charging circuit that charges several different sizes of lithium polymer batteries which in turn provide the power source for the regulated 3v/5v supplies.  They can be charged via the solar page in the book, USB, or wall wort with a 5v charger.  It has a circuit to charge my phone or other usb devices.  Later, I also put in an Arduino microcontroller, a speaker, mic, photo-cell, and some lights.  I use it as a portable testing bed for circuits and code.  I have intentions for more sensors and outputs in the future as well.
   The main compartment contains the electronics.  There is another compartment beneath which holds the wires and other accessories.  Between the bottom compartment and the back cover is an accordian folder for the "pages".   
   This project is conducive to individualization, so you may need to use other parts to achieve your desired goals.  For this reason I am not going to list materials up front, but I will explain which tools and materials that I used in each step.  If you have any questions, please ask and I will try to answer as best I can.  Of course, suggestions are also welcomed.
   To start, I chose to use the Diprotodon,(but would later change to the nearly identical   Koala)(Datasheet) from Sparkfun as my main board because it has a lithium polymer charging circuit, lots of space to play, and a usb to serial converter which lets it talk to a microcontroller (though I didn't know I would want this at the time).  I have a variety of batteries that it charges: 2000mAh, 200mAh, and a 110mAh.

Step 1 Choose a book and prepare it.

   Choose a book that is going to be the right size for what you want to put in it.  I wanted it to be relatively small, normal looking book.  I wanted everything to be contained inside with no visible plugs, wires, etc..  I hollowed mine out in two levels.  The top level is about 1" deep the bottom level is about 5/8" deep.  They are both about 4"x6".  I cut out a wooden template with my jigsaw.  This helped keep the pages evenly compressed as I cut with a utility knife.  It was slow going and a little messy but not too bad.
   After they were hollowed out, I brushed lots of glue (I used PVA, you can use white glue or whatever) on the walls inside the compartment, working the bristles of the brush inbetween the pages a little.  Then use some of the paper you cut out and line the inside of the compartments, firmly pressing it flat.  Allow to dry thoroughly.  You may want to do each compartment separately.  BE CAREFUL not to glue your book closed!  
  Next, I sliced the cover paper along the spine cover and allowed it to flap open to expose the spine.  I made measurements and drilled and cut holes in the spine for my various connections.    
   I then covered the entire outside with book cloth.