I found a wav trigger device that will be easier than the Raspberry Pi for this project and also realised that I cannot use the existing switches due to current running through them so I just need to work out some type of secondary switch where I want the sounds to trigger. I am sure I will work something out there so I will keep you updated. Here is a link to the Wav Trigger Device.. https://www.sparkfun.com/products/13660

Still working on the backglass and finishing of the stencils ready to restore the cabinet.
In the meantime I have given the inside of the coin door a once over which came up great, here are some before and after pics.. 

Cheers: Brettski... :)