Based on the top pic, the side vent appears to be mashed up. You need to be careful in gluing the parts together, making sure that the edge ID numbers are lined up as precisely as possible. If this is your first time putting together a pep model, you might want to practice first on a low-def model to get a feel of what it takes to assemble one (like folding and gluing) and then you can move on to a higher def model. Also, did you use a 110-lb cardstock paper or just a regular copy paper? It looks more rumpled than it should be.
It's 65lb card stock. The store I went to didn't have 110. I'm planning on getting 110 and super glue. I've been using a glue gun hoping it would work, but it dries to fast I don't have a lot of time to stick everything together. Guess I'll be going by walmart tomorrow lol. Good thing I asked before I finished it.