i understand the reason to hide the HUD but why character model? and "showhud 0" might be it; i'm not sure
try ToggleHud or DebugToggleHUD This will break when you try to upgrade Turrets or Buy skills. Toggle it back to get out of the skill picker/turret purchase menus.
Thanks. EDIT : I made this and posted it on the wiki. http://images2.wikia.nocookie.net/monda ... _lvl_1.jpg