I picked up an Imperial Knight today along with the rest of the GW community. The model is fantastic, but it is missing a cockpit. Since the hatch is removable, It seemed a shame to build it without adding interior detail. So after a quick raid of my bits box, and a few minutes with a dremel, I was ready to go. Using my Warhound titan as a reference, I added a command throne, sensors, pipes, hoses, and other random equipment. Not much can be seen through the opening, but it does look cool.
*Edit --I added some shots of the interior as seen through the hatch. It is easier to see in person than capture with the camera.