player models vanilla mod

READ THIS!!!
Hello, i made a command creation where you can be any mob you like.
If you wan't this in your world, you will have to copy this.

INIT:/summon <mob> ~0 ~0 ~0 {Invulnerable:1,NoAI:1,CustomName:"<your username>"}
/tp @e[type=<mob>,name=<your username>] @p[name=<your username>]
/effect <username> 14 1 0 1

When you are done you go to this site:

mrgarretto.com/cmdcombiner

You now paste it into the generator. When you are done you fill the text where you see <mob>, with what mob you want. Do the same with <your username>. You put in your username. When you are done, you click the generate button and a giant command appears. You copy paste this command into your command block in your minecraft world and you power it.
Done! 

This is multiplayer compatible!

Thanks to MRGarretto and his command combiner!