All that needs to be done is to use the base osiris model and add a few corsair features and textures. Give it the typical corsair ship 'spikes', maybe some close vertical wings on each side like the gunboat has, and then retexture it to fit the corsair ship theme. A full replacement isnt really needed.
Balance-wise, I'd just like to see the corsair version lose some agility (not a huge amount) and gain some armor in turn, to fit with the balance theme of the rest of their ships - heavier, but harder to kill.
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