On all but 1 of those pictures, nothing is drawn to proportion. Men are the size of houses and boats. On the other, the "pole hammer" is significantly smaller than what is done in game.
I'm not saying that you've done a bad job with the majority of the weapons in c-rpg, I'm just saying that you don't need to get it dead on historically accurate to make people happy. I personally think that the strange armors are close enough that only the most otaku of wee-a-boos will give a shit... and who has ever cared about what they think?