You may have better luck if you're able to provide more details about what your ponysonas look like. If you're needing a lot of sculpting, or crazy dyed hair colours, etc, it limits what people would be comfortable doing such things. Things like breed (uni, peg, earth, alicorn), generation preference (G1, G3, G4) as well as colours, symbols/marks / reference sheet / etc would be helpful as well.
I know I don't like jumping in to an agreement blindly without knowing what will be expected of me.