I tend to agree that, if you're starting from scratch, the answer would be massively thick ports.
I did come across this drawing that uses either a full frame outside the ports or retainers spaced around it to hold the storm shutters
I tend to agree that, if you're starting from scratch, the answer would be massively thick ports.
I did come across this drawing that uses either a full frame outside the ports or retainers spaced around it to hold the storm shutters