I don't see why contacting CA should be useful. If they really want to depict the Celts accurately this time they will have no problem getting the required data. Unlike in 2003/2004 even the most lazy people can find decent information about Celtic oppida and their defenses after a quick wikipedia search. At least in the german wikipedia already with some relevant scientific literature listed in the bibliography.
Also CA is already aware of EB as the mentioned the mod several times favorably in the past.
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