For adding models, basically what you need to do is move the mdl, vtx, vtd clip etc files for the model you want to backport to the data>models folder. After that you just need to add a few lines to your player_costume.txt to point to your new files (if you don't know how to do this just look at how other sets were added in it as reference and modify those). Finally you need to edit both your client and server DB's as well. CustomizeItemInfo, CustomizePriceInfo, EquipItemInfo, and ItemClassInfo - you need to add your new set to these tables. The parameters in these tables are pretty self-explanatory, so again, if you don't know what you're doing just reference how other sets were added to the table and adjust what you need to point to your new set and it's relatively simple. Might've forgotten a few things but I'm pretty sure that's the gist of it.
Although the main problem now is actually getting the model files which I made a thread on just recently. The latest KR Vindictus version uses a new form of encryption on its HFS files that broke all the pre-existing extractors so it's impossible to pull models from it. If you have a non-updated client before the encryption changed or knew somebody who could share their older HFS folder, you could use the extractors that way, but it's unlikely anyone still has those. I've seen some of the newer models get ripped somehow though, so I think there's definitely some way to crack them, but it is not public information if so. You could try taking a shot at asking one of the server owners about it or somebody who rips Vindictus models for more information if you were really dedicated, but they may not be as inclined to help. Although you can still add your own models to the game if you know how to convert them using the method I outlined above.
