Interestingly enough, many, many years ago (like some time in the very late 1990s kinda many years ago...) I tried to find armour values for bank cars and so on and I actually found it easier to get valid info on military armoured vehicles.
Seem they were a bit paranoid back then about criminals getting the specs (fair enough point) for cash transit vehicles and the like.
As for A Rock In Troubled Waters, yeah it's a good piece but I believe that, because it's a fan submission, it's considered as support material but isn't canon per se.
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