"By Thruid"
Let me see if I can help some people out, went ahead and tried to update the Nutshell part.
1) open mywarcraft studio
2) go to common or patch.MPQ
3) find the name of the model you have that you want to change, write it down into your notepad.
4) find the .m2 of the model you want to be, then make a folder in your C:\Program Files\World of Warcraft\Data then make a folder called Creature, then make a folder called the name of what you have that you want to change.
5) right click and extract the .m2 of the thing you want to be in there.
6) rename it to the thing you have.
7) go to common or patch.MPQ
look for the .blp name of the thing you have, write it down in notepad.
9) look for the .blp of the thing you want, to be, then right click and extract that to the folder called the thing that you want to change.
10) rename the .blp of what you want to be, to the .blp of the thing you already have that you want to change.
11) click on Pack(P) then create new MPQ archive, go to C:\Program Files\World of Warcraft\Data, then make a file there called patch-#.MPQ (# being 4 through 9)
12)then click on add file to archive, click the ... button to browse, go to the folder you made in your C:\Program Files\World of Warcraft\Data, then double click the .m2 or .blp, then look at the top of the folder, and copy the Creature\***** part, then make it so it says Creature\*****\*****.m2 or .blp, the ***** is the name of the folder of the thing you have that you want to change.
13) do it for the .blp and .m2, then go to Pack(p) and click Save and close archive and your done.