I was able to easily release the latch by putting the spudger in the optical drive slot, and gently prying up. You can see the three holes where the upper case clips in above the drive, and the clips are accessible through those holes from the optical drive slot.

I couldn't get the top two 11mm screws to come out, even with a magnetized driver. When I tried to keep unscrewing them, they clicked like they were spring mounted, and I didn't have any trouble leaving them in and continuing on.