The problem with trying to make keypads using entities in hammer is, I believe, the fact that you can't make it so a certain SEQUENCE of buttons pressed opens a door, IE: to open a door with code 1234, you would have to type in 1-2-3-4, no other order.
But with the hammer entities, it winds up so that you can put in the numbers in any order, so long as they match the numbers in the code. IE: 1243, 3214, and so on.
At least that's the problem I'VE had when trying to do it, full keypad functionality just isn't possible with the standard entities.
So joe, in your most recent post, the last two screenies look really empty and boring in contrast with the first two, are you planning something to go in that room?