After finding absolutely nothing on the internet for what is under that cover and lots of people wondering including myself, I put Smokeythedodge to the task of getting some pics since he has that 24V just sitting out there. He came through in a big way taking a lot of pics. You can see the pushrods going down right into the top of the lifter/tappet. You can see that some lifters are up and some are down because some are on the cam lobe.
Also gives you a sense of why you have to jam dowel rods into the lifters and pull them all up if you want to pull the cam out, otherwise the lifters that are down would hit each lobe of the cam.
Thanks again Smokey!