**EDIT**
You are doing a good job, but honestly, the model you sent still needs some work in details beside the missing parts.
If it is only modeling I'll do it for $80
If you want textures I'll do it for $140
I can do it, man.
Hello, I'm a 3D artist, I can make this model, please feel free to see my portfolio here in my profile to view examples of my work.
My only question is for what you will be using this model? It is really cool by the way.