Tardis Inspired Engagement Ring box

I and my girlfriend really love the series: Doctor who.

For an engagement proposal to my whovian girlfriend, I was thinking of an idea for a ring and a nice-looking box. And I thought Tardis could be a great idea for a promise for an engagement, as it represent the thing in the time and space.

From the consideration for the structure of the box, I decided to make the box in slide-up style. At first I thought the 10th doctor's tardis, but my girlfriend loves Matt's seasons. So I changed