While I too think the kodiak is probably the worse looking ship in sins, I don't think that anyone has taken the time to make a mod exclusively for getting rid of it. Of course, it wouldn't be to hard just to download a mod with a model you like, copy the model and texture files into a new mod, then change the kodiak entity file to reference those files instead of the tank in space model. Of course firing points and shield overlays could be a problem...
Its probably easier just to deal with it or just start playing a TC mod.