Gi'day there,
I have solid PHP and general software engineering experience, however I lack the Ruby on Rail experience that you have requested - not sure how much of a show stopper that might be..? I am comfortable in a Javascript environment......but I would not claim deep experience in JS.
Anyway - I am Sydney based if I can be of any assistance to you. It was a bit hard to give an accurate quote based on the pretty open-ended projects description, so if you are interested to see whether I may be suitable for your task, drop me a message.
Regards,
Stephen