Hello modders!
I've a dream, modify W0W to become more modern and fast to learn an play, like a Moba (https://en.wikipedia.org/wiki/Defense_of_the_Ancients)
i want to:
1) give max 5 active skill/spell for each player (and some passive)
2 ) modify every class/race combination to become unique (hp spells stats some equip)
3 ) cap level to liv10 with small diff between levels (+5% stats each level for example)
4 ) timed equip (every magic item has a cooldown, after was destroyed/unusable, shorter for dropped items, like some weeks, longer for crafted items, like some months)
5 ) some not available race/class combinations, like dragons, demons, not playable races
6 ) every one creates his own hero, not play with thrall illidan jaina etc.
you can play in pve (quest & istance/raid) pvp (battlegrounds, arena) openworld (quest, roleplay) or conquest (spawn npc unit to conquest cities)
openworld increase reputation, pvp increase battle skill, pve help item creation and resource collecting, conquest give command skill and bonus to other 3 player mode

with wotlk i can do a lot of thing, like new spell class race maps items etc, but i was away from W0W for a long time, which client ver. is a good choise now to start editing??
for example i want pre-cata azeroth-kalimdor maps, but if wod-legion maps can be edited to be pre-cata i prefer newer clients
thanks 

you need to:
-open felblood.m2i and save horn&wings geoset in .blend format
-unload .m2i and load .blend file
-create a .m2i file from a clean model (bloodelffemale.m2 for example)
-import new .m2i on .blend, duplicate a mesh (like body) and attach on it wings&horns, save the .m2i and unload
-import .m2i and delete mesh attached to Wings&horns, change hardcodet textures and save it
-merge .m2i with original .m2 file
-edit hadrcoded textures and add a new texture for horns&wings (i've replaced DKeyeglow texture with horn&wings textures, you need to create a new hardcoded texture instead)
you can also add new hardcoded texture to model before exporting it in .m2i (if it doesn't corrupt m2 model)

it must works, i've tested it with a lot of models v3 & v4
you must use blender 2.49b, newer doesn't work
link here the error log

sorry but i don't use mdlvis, it doesn't run on my linux box

sometimes m2i exporter doesn't work correctly and m2mod wasn't able to merge m2i and m2 models
you need to test every few change in m2i merging it with m2 ant test it in game
if you are importing mesh from other model remember to swap bones and delete bones that doesn't exist in m2 model (and reattach vertex to another bone)

ok but tuskarr skeleton hasn't bones to animate cape, so if you add it you can't animate correctly (you must attach it on body)
without a good tool to fix skeleton and animations it can't be fixed as a blizzlike race model

only way to fix it is to import mesh on another skeleton and use its animation (for example a dwarf) but you will lost all beard/hair animation