Still learning my way around Blender, so I apologize for the newbie question.
This is the piece I am trying to work with before applying the subdivision modifier. [![Unaltered mesh]]
Here I have altered the mesh a bit by dividing some faces and using extrude region to add some detail. I go and use the subdivide modifier. I want sharp creases on the extruded area, so I crease the areas to 1. Once I do that the corners lift off the base mesh.
How do I fix this? Is there a better way (different method) to use to add the detail?
Example Blender file: https://blend-exchange.giantcowfilms.com/b/2501