I want to make a model for a game with Blender, right now I am making an escape pod for a spaceship, just the basic mesh structure that will have a texture (which I will figure out if there's any problems later), but here's the problem, I am getting an unwanted corner mesh when making the doorway into the pod.
Couldn't post a picture here, sorry
But I have tried making more cuts and they don't work when using them to cut down the mesh, here is the blend file: 
PS:(It is happening to all four corners of the doorway so it'll most likely work for all if it works with one)
Here's a blend without all the cuts if it makes it easier: 
NOTE: The nose cone isn't done in this version!
