No worries mate, I do try to help. A full length Raging Bull kydex holster (giddigy) would look epic. I don't think that style of body armour would cause any overheating at all due to the design being just to cover vital organs (bit bigger than an A4 size), and I do get your wanting to go badass, but I've told you my experience, If we ever meet at a skirmish I'll give you an iron man game lol (no shirts, and full auto rifles in kill houses). I do have a bit of an advantage in terms of body temp as having lived in both Pakistan and Siberia my average body temperature is 34 degrees, with my record being 28 on a very cold morning.
I cannot comment on how much protection a balaclava would provide, but it is better that nothing and it should reduce the power just enough to prevent tooth loss, I personally use a face wrap.
It's rather ironic that your're going for a super criminal (type)
While I'm going for a super cop
Imagine the show down