Mundus Gigantus latest version for Rome TW Barbarian Invasion 1.6. This is the main download link of it.
INSTALLATION:
Unpack the archive. Throw the contents (folders bi and data) into the root of the game with the replacement of all files. Run the game from the shortcut bi.exe.
Note. 1: Before installing the mod, it is recommended to delete the portraits folder from the barbarian and nomad folders. Folder addresses: bi/data/ui/barbarian/portraits and bi/data/ui/nomad/portraits.
Note. 2: Nature from RSII is not necessary. It's built in by default.
Note. 3: The mod is not a switch, but it may well get along with other mods that do not overwrite the files of the bi folder. The Imperial Crisis II mod is compatible with Mundus Gigantus.
(This hasn`t got translation to eng... for now)