Great results mate!
Have you done a thread on the zinc plating? Interested to see if I can give this a go.
It is a process of trial and error. Patience is the key with doing your own plating. It is much cheaper than taking parts to a professional and risking them being lost. I covered some of the process in the Ace High Restoration ;
http://aussiepinball.com/index.php?topic=5421.105I could do a full write up if warranted. It is easy to do, you just need time, patience and a system to use and store the equipment.