Presentation Schematic

So my dad is going to help me build a cool case for my project.  It will include a window for the aquarium and also for the screen of my iPad mini....since I am going to use this as my main way to do the presentation of the experiment.  Below is the drawing I did with all the measurements.  Later today my dad is going to drive me to the Home Depot in order to buy all the materials I am going to need in order to make the box.  My dad said to add at least 10-20 percent more than I actually need just in case I cut a piece wrong or make some other mistake.