I just don't like all these overly curvy pseudo-ergonomic "organic" designs. To be honest I was never really a fan of halo's covenant weapons. I like angles. I also like simplistic silhouettes. I think it's best for every detail of a weapon to be logical, they're only tools after all.
I think its only fair to say that your execution of the concepts in both 2d and 3d looks great to me.