BeBro,
The Barbarians use the first set of designs by default.
You should in theory be able to change the city designs of the other tribes by amending the leaders section in rules.txt. If there is another set of designs that you don't intend to use (e.g.'Far East'), copy the 'Classical' designs over that, make the leaders switch, and amend the Barbarian city designs to fit your preferences.
You can alternatively start tinkering around with the technologies in rules.txt and use the industrial or modern city designs by giving specific tribes 'industrialisation' or 'automobile + electronics' respectively. For instance, you can switch all of the normal tech flow that uses 'industrialisation' towards a 'user defined technology' or 'plumbing' - rename it, and change 'industrialisation' (the original) to 'no,no'.
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