"And since the answer to my question is not forthcoming I have to assume nobody has even bothered to take the measurement. So if this is the case, how can I be wrong when the data has never even been taken ?"

Why assume that because answers are not forthcoming on this message board that "nobody has bothered to take the measurement?"
JB told you that the buildings are largely restorations. Do you think the architects could build the restorations with no measurements? You confuse the lack of interest by anyone here, in spending time researching your questions to provide you with numbers, with the existence of said numbers.