I love the new Thinlit card dies by Stampin’ Up. Before I had an opportunity to play with one, I saw this card by Mary Brown 
I loved the way she added DSP to the right panel but I prefer to have a border of the base showing rather than have it all flush with the edges as she did here. So I did some thinking about how to do this. Mind you I still was away from home and didn’t have access to the dies or other materials. My daughter won the Label thinlit card die at Convention and on the last day she was with me on vacation I quickly die 2 bases for the flip card (planning to order the dies right away and have them when I got home). However, life got in my way and they didn’t get ordered until last Friday. 
As it happened my fellow demo Jo and
I got together that afternoon and she brought her dies.
I played with cutting my DSP a smidge smaller, gluing it to the right side and then cutting with the die. But that still left the edge where the label cut out flush as we see in this one by Robin Messenheimer :
I tried cutting the base out of DSP and trimming away the excess then gluing it on. That worked –sort of- but the matting around the cut out was still not quite right.
We were madly designing away until we discovered that my warped clear plates didn’t play well with either the dies or the magnetic platform.
So I set aside the pieces I had cut out until yesterday when an idea occurred to me. The Framelits cut away on the inside of the flat shape. The outside of the framelit die would be a perfect mat size and shape. And this is what I ended up with:
(no the card isn’t finished, just the base)
So lets talk about how to get those perfect panels.
1. Cut your DSP into 2 panels as follows:
1 7/8” by 5 1/4” Left panel (cut one)
2 3/4” by 5 1/4” Right panel (cut one)
2. Cut your cardstock using the labels thinlit card die
3. Using dotto or other temp adhesive place your DSP in place (one side at a time), close the card so you can see the back of the DSP as shown. With a pencil trace the opening.
4. Now place the 2nd smallest label framelits die so the pencil marks you made are just barely visible on the inside and trace the outer edge.
You will see this.
5. Cut out the opening on the line furthest from the edge with scissors.
6. Adhere panel to cardstock base. Do the same for the other panel and decorate as desired.