Not sure if this is on your radar, but if you get a new case and don't have a 64C to plunder, you are going to need to get some brackets to hold the keyboard in place (or 3D print them yourself). As I think I mentioned earlier, I got the metal ones but once the case is closed 3D printed ones are just as good! I've also 3D printed a "gap filler" for around the power plug and the case with my Reloaded machine.
And you'll need an LED light for the power indicator.