Did you tell it to specifically build those structures, or did you tell it to 'construct a base defense'? If you told it to construct a base defense, than you need to define that structure with the BaseDefenseStructure1 = statement for the relevant side in AIData.INI.
Failing that, you need to make sure that the AI has the pre-requisites to build the structures you want, usually a Barracks in this case, and also that it has the correct Command Buttons to build them in its Dozers' or Workers' CommandSet.
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