I shared a card similar to this earlier this month and somehow this version of it never made it to my blog before now. I added a piece of acetate to the front flap of the card (which of course being clear you can't really see here) for stability. There is a greeting inside the card that is hidden by this front piece when the card is closed.
This came from a kit and the card was designed to be like this (minus the acetate). I'm not sure I would mimic this design often. I like the front of my cards to be robust and cover the inside. It's fun to try different things though.
The Fine Print: Card topper and part from Club Scrap.