I too love the weapon.
It seems to me to resemble- that is, the blade resembles- one of the curved towers on modern Cardassian architecture, though I have no idea if that was intentional (though given your comment above about tailoring it to a Cardassianb aesthetic, I'm guessing it is). I also like the chest armour that links this design to the modern Cardassian Guard uniform. It's details like that which make the design believable as historical; it really slots into established Cardassia nicely. And as others have said, that;s a great job on the chainmail, particularly on the "robe".