I've added a game_data_deepones.php file (based on the Apes of Wrath file, but modified) to the lib folder and added the following line to settings.php in the public_html folder:
'Deep Sea Ones' => true,
the above line is added in the same spot where you turn on/off the rosters for Apes, Khorne & Bretonnian.
Everything looks correct, but I'm sure I've missed a crucial step to connect the dots between the setting.php file and the game_data file. Does anyone know what else I should do to add this custom team to the site?
Thanks for your help!

EDIT: I did give the team a unique id number, as well as the player positions, btw...
define('T_RACE_DEEPONES', 27);