copied the page to study and try one. It does look like it is good instructions lets hope so

by danababes 11 Mar 2011

Mat board is thickish cardboard that is used in picture frames. The "mat" is the the cardboard frame around your photo within the glass & wooden frame.

Poster board - just looks like they're referring to a thin cardboard to make templates out of. lol I'm cheap so I think my first try at this project I'd be using a cereal box in place of poster board, and maybe icecream container lids to cut all the pieces from since they'll be covered in fabric anyway. xXx

Shame they dont include a photo of the finished box, let alone step by step photos.

by mops 11 Mar 2011

I had a look there befor and noticed it describes a hexagonal one - principle is the same of course, just have to figure out the right measurements.