My process:

Okay so I started with a quick sketch of my idea then i had my teacher scan it:

Next as i started to build it i learned that all of it had to be in millimeters, but i had already drawn all the measurements in inches. So of course to solve this problem I did a quick Google Search which resulted in this:

So after quickly (sarcasm) converting all of my measurements into mm I started to build the bottom of it (it actually over time became the top).

So inside