re: 2nd iteration of this multi-sided box

I do like that... Is the 4th picture the one with the foam, it that the hinge... Could you explain that.  I am make each of my immediate family little desk clocks.  Trying to think of something different for my youngest grandson... He is 12. a   A similar 12 sided box, on side for each hour would be unique.  The clock insert in one end and the addition of a box to put keepsakes in.... Wonder is I have the skills to pull that off.