The Valentine's castle box

Mia's teacher sent home a little note last week about the class Valentine's Day party. Students were tasked with creating their own Valentine's mailboxes. But Mia's teacher didn't want them to just decorate a box. They were supposed to "think like engineers" - come up with a design first and then figure out how to make it. This is Mia's design: 

She decided to make a castle using three boxes, Christmas wrapping paper, duct tape, stickers and markers. She said her box was tied with a classmate's for the biggest mailbox in the room. I'm just glad she was able to carry it into school unassisted.