I actually lined the box with wax paper. This would prevent the cardstock from being damaged if I were to put goodies in the box. I used a piece of coat hanger for the handle but this was quite hard to bend. I would suggest something lighter.
The matching card is a cute idea if you were going to use it for a gift. To make a box like this, you can use the template I have created! Just copy the picture to Word, make it as big as your page and then print it right onto your cardstock. It is pretty easy to see how to folt it once you get it all cut out. If you are having issues I am ready to help :)