Let's do some planning for password GUI's
Here's what i know:
I've never seen GUI's that send text from client to server. So, I assumed this is hard or impossible (please tell me you can do that).
What I plan to do is a 10 digit password input buttons, with a text displaying the password you entered, another button will try and validate.
Also, I can combine this with the idea of multi-owner chest, where when players enters the correct password, they will be added to the owners list.
To change the pass, just destroy and re-put the chest.