I would love to, I have plans to make a Goblin NPC too. The goblin would be apart of the Runescape Total Conversion Mod. Unfrotunately we cannot modify models of people at the moment. (I tried to but the object disapeared.)

Though we could give it another shot, do a simple change, make adjeustments to the skeleton of the model and make sure it's all dandy there. Then if it works, we're good.

I'll go ahead and ask Dan2D3D (He has connections with the dev team) if it's possible to modify the model and skeleton of characters at the moment.

If the devs say yes, then we'll begin working on a Dwarf model. First we'ed like to work on a Goblin model though. You can follow our Steam Group if you'ed like. We've already made a lot of progress on our mod. We're just waiting on more content. We want to release the mod when it has more substance.

-Coggernaut, from the "Super Friendly Mod Team Hyper Force GO!"