What fixes? AFAIK the missile corvette version worked fine? It's smoothing was also okay to my memory, though it has been a few years since I last looked at the POF.
I remember you worked on getting the model to work properly, which it does. I don't have any POF errors or other issues with the model, so I would say it works fine.
I might not have compared them properly last night when I saw this at first. Having them side-by-side in PCS2 now shows that your version only might have the smallest sharp edges here and there, but nothing egregious.
I do always like to see people take a look at the already existing models and see if anything can be improved, which is where my original comment came in.