This accordion fold card comes with the base and mats and is easy to put together! To get an A2 sized card, you will need to cut this one on a 12x12 mat. However, the cut can be scaled down for a smaller version which will create a card around 3-1/2" wide x 5.18" tall. You can see a completed card and a full tutorial on my blog: http://jamielanedesigns.blogspot.com/2013/06/accordion-folded-card-eleven-years-old.html

(note: staged sample photo includes pieces not included in file)