I think it's pretty obvious what's the front and what's the back ^^
You don't need a mouthguard on your back right? :P
I will make it clearer though, I'm also thinking of adding small blue lights, or small orange and green lights.
Still got quite some mapping to do, but that'll come later.
Things I'll add as details are:
Decals, names/typenumbers etc
Wires
Breaks and cracks