Nginx PHP + Thin Ruby possible?

[ewwink]

Hello,
I'm planning to proxy_pass from nginx to thin it is possible? for example

Nginx + PHP => world:80
thin + ruby => localhost:8000

for Nginx + PHP I will use

https://github.com/iphoting/heroku-buildpack-php-tyler.git

and for Ruby App (thin)

https://github.com/ewwink/Ruby-Whois-API

The problem is I have no idea how to run thin with custom port so anyone please suggest me.

thanks