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Danyal Davies. Candle Design.
Isn't this the same project you were working on before?
I would still recommend giving yourself a smaller scope of a project rather than trying to get lots of people on your time. It will be hard for you to find people that want to work for free on such a big project.
You should see what you can achieve with the skills that you already have (since you already made that underground station I presume they're pretty decent) and go with that. You'll big your skillset a lot quicker this way.