Put some keycaps on and it's looking pretty good.  I need to glue down the display a bit to contain the leaking backlight.  I didn't have any Enter or = keys that were one unit big, so I improvised.

I've found that I really need a backspace key because I make a lot of mistakes while typing on it.  Also, I can use it as a "drop" function to remove items from the stack.  At some point I can try to design a base for it and 3D print it, but I've never done any mechanical CAD work before.

One with the screen removed: