Closest to the front and rear windcreen it is a round steel tube. I do not remember the rest, but it would surprise me if they were flat, as the rooflining would not be as flat.
The people cutting through it need to be very skilled, if they make a misstake and the roof sub structure is weaked, or get a different stiffness, the roof can start to move/vibrate and then you will have a problem.
The construction Bristols have is a modified Superleggera on a "standard" stiff Chassis
The Superleggera principle is very sensitive to changes.
Yes, the chassis is stiff, but the body is not.
As I opted out from a sun roof myself, I am not sure if they will fabricate drain channels or how the water is drained away?
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