The completed box measures : 3 and a half by 4 and 3 quarters and 2 inches deep.
Firstly cut two pieces of card stock to 12" by 5 and a half" (you can actually get away with 11 and 3 quarters" by 5" if you are careful). Run them both through the machine.
Fold along the score lines (I tend to have the creases facing up and fold towards me along those lines) and attach tape as shown below (I have actually made a mistake in my haste and added tape to the top of both larger pieces - you only need to do this to 1). I recommend strong DST for this.
Next, attach them to make a T shape keeping the tabs on the inside of the completed box.
The box is now ready to be decorated. I attach panels to each side as this dnot only decorates the box but also strengthens it. Below is pic of all the parts:
I have worked out how to get enough panels for 2 boxes out of one A4 piece of cardstock. Here's a cutting sheet to show you how (this is not to scale and shows an A4 piece of card as being the thick black on the outside):
And here's a close up of the finished article:
Hope this helps and answers any queries you have and that it is useful to some of you in the future!