My attempt: https://i.xfix.pw/minigmail.png https://i.xfix.pw/minigmail.png I sorta feel like you could even remove "More" button here without losing too much.

My attempt: https://i.xfix.pw/minigmail.png https://i.xfix.pw/minigmail.png I sorta feel like you could even remove "More" button here without losing too much. Reply box would be at the bottom of a message, just like it is currently. More buttons could be added for users who actually use this functionality (for instance, if you have categories defined, a button to move would appear).