Programming Neopixels as a Classroom Clock

I'm brand new to Arduino and programming, and am trying to replicate this project for my own classroom.

http://www.instructables.com/id/Classroom-Clock/

I been successful prototyping everything merely because I followed her instructions exactly. However, I'd like to double the number of LEDs to make the clock brighter.

https://github.com/jdeboi/Classroom-Clock

Using the code from github, I'm unsure how to modify it so that my arduino accounts for the doubled LEDs. I assume that these lines from the code map different LEDs on or off for a given digit:

byte numbers[] = {
  B11101110,    // 0
  B10001000,    // 1
  B01111100,    // 2     5555
  B11011100,    // 3    6    4
  B10011010,    // 4     3333
  B11010110,    // 5    2    0
  B11110110,    // 6     1111
  B10001100,    // 7
  B11111110,    // 8
  B10011110    // 9
};

The original code above uses 1 neopixel LED per digit segment. I'd like my segments to be constructed of 2 neopixels each, more like this:

                11 10
             12        9
             13        8
                 6  7
              5        0
              4        1
                 3  2

I've tried looking up other guides on 7 segment clocks and they all use different ways to map out the segment digits. I'm unsure where to go from here.

I'm unsure where to go from here.

No problem. We can help you out. Head over to http://snippets-r-us.com for help with your snippets.