Ok now that the fumes have worn off I think I will leave the backglass for now and move onto the cabinet..

After a bit more thought and research I have decided not to rebuild the cabinet at this stage instead I am going to try a product called Earls Wood Restorer to solidify the rotted timber.
If this works it will save time and money, once this has been applied clamped and cured I can then bog the remaining rough areas then sand back to timber ready for fresh paint.

The biggest hurdle I have is trying to remove the metal rails without damage as they are still good and worth re using with a polish up. I am going to attempt to put a notch in the head of the twist nail with a dremel so I can hopefully get a screwdriver to turn it enough to get a grip with pliers, I will let you know how this works out.. 

Playfield is looking great, once polished should be even better..

Here are some pics of the cabinet..

Cheers: Brettski... :)