Hi, I am software engineer from Serbia.
I already have develop slot machine game, we should just update it to fit Facebook requirements.
I can send you demo how game look now.
It is really easy to update graphics to fit your need.
Audio is still in development phase but it can be finished in dew days.
Let me know if you have any questions, and if you like contact me so I can send you demo.
Thank you and kind regards. Mike.