Full customizable box

There are plenty box scripts, but I needed a fully customizable box for an advent calender for small things - not to surprise my kids, but my wife :-)

The box is fully customizable (width, length, height, the wall and bottom thickness, tolerance between top/bottom part, but as well 3 line of text with different sizes (for the advent calendar, I used the middle line, while I entered a "space" in line 1 and 2.

I tested the script pretty well. Let me know, if you struggle with it - thnx in a