In the original, I'd swap the kitchen and bath, and add the mud room to the right of the kitchen. Put the exterior door in the mud room and delete the exterior one into the gun room in the lower right corner.
Alter the bedroom, bath, and kitchen, adding doors to connect these three with the mud room, making it a "walk thru" from mud room thru kitchen thru bath into bedroom, providing triple security for you when ensconced for the night. All those doors lock, right? Make the door from the bedroom into the gun room a serious vault door and delete the doors from the kitchen and bath into the gun room. This will still leave some space for a utility room or whatever at the far right end of the "upper tier", accessible from the mud room.
The wall between the gun room and the "upper tier" is, of course, concrete as are all the exterior walls. Windows? Nah, who needs windows?
Bunker? Oh, yeah!
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