Oh god I'm retarded! when I click Build & Publish it just throws an error that some file is missing and the console fills up with missing script errors but I swear I've followed the instructions step by step. 

The model creators instructions are just:
>Create a new project with Unity. 
>Import VRCSDK and DynamicBone (optional). 
>Import the Unity package included in this data. 
>Double-click the scene file to open it and the settings will be loaded. 
>Upload your avatar to VRChat and you're done.

And I must be some sort of omega level retard to be fucking it up somehow ;.;