I made a helmet with a part so the face will be visible...well I thought I just dont need to cap the gap and that's all but seems that I need to make more than this
What the hell did you do to get that? The head model loads automatically under all helmets.. I really don't see how you could have messed this up.
Maybe the latest version included a flag to hide the face? (I don't know since I haven't checked that out yet..)
That's actually been around for quite some time. I suppose it's to cut down on tris when a helm covers everything. There's no point to load the head if you can't see it.