Place this files in your Tribes2\Gamedata\base\textures\gui folder (I recommand making backups of the old files)
hud_new_cog - transparent Compass & Healthbar
hud_new_scorewindow - transparent scoretable (I recommand using dio's script cause it will remove the line inbetween the scores)
hud_new_panel - transparent background for weapon, grenades & pack huds