So I made it into a box! Unfortunately I didn't specifically work off a pattern/template - I kind of DIY-ed it.
I constructed a cardboard box - making the widths of the four sides a millimeter smaller than the template. This is so that the lid would fit on top with ease.
... Honestly, I don't really remember how I did it - it really was a spur-of-the-moment kind of thing that I made up on the fly!
This is what it looks like with the lid on: [link]
Hi there! I made a Companion Cube too, took me a week... guess it's good enough for a 13 year old. XD I didn't do the lid thing though since I thought the interior of a Companion Cube should be concealed. Check out my profile!