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Select which model you'd like - with open back or with a roof and extract the according file somewhere.
Than rename the file to barracks.dff and use IMGTool or Spark to insert it into your gta3.img file.
It is not necessary to replace barracks.txd, as it is the original texture.
MAKE SURE YOU MAKE BACKUP OF THE FILE BEFORE INSTALLATION!!! (Extract the barracks.dff from the gta3.img)