Thanks for the comments
The proportions are about my proportions ( + armour pushed up a bit), and I don't have heroic proportions. I just weigh around 61kg. I made the enemy character have beefed up body and legs.
The torso section goes a bit over the legs section. The pants have some extra room, because I usually keep my pants somewhat down, but not as down as some weirdo hiphopgeeks. I've measured my body with clothes on and I've measured the model and they have just about the same values.
If I changed the helmet like that, my face would come out of it (if I didn't hide/remove the face model then), or I should have a face like a cat. Oh and this is not an evil character, so the eyes in the helmet shouldn't be that way. Also most gasmasks have big eyeholes in them, so you don't need to turn your head to look around, only your eyes.
Here without helmet:
edit.. some progress on it:
And here's something completely different: