It will make sense story-wise. Be patient :) I will get there, eventually. Right now I am adding more nodes to weapons as weapon mixing/crafting device is done and I want just to add more stuff (and not just stats oriented).
Although I am still not sure about where to put weapons for human hands. Arm mounted weapons are easy to access, replace etc. It only doesn't make sense for a human being to have them there. If I won't find any better solution (that would be doable in not too long time), I will at least change the mechanism a bit.