There are a lot of pieces but they come apart pretty easily. just take some before pics so you can remeber how they go back together. i would not paint or powdercoat the parts. if you want to redo a stack you should have the parts zinc plated. there have been several threads that talk about the dos and don'ts of renovating one. Really not too hard. Most everything except the bottlegates, springs, and screws get replated. you can get new rivets to reconnect the bottle gates to the gate arms from several of the site vendors. Just polish the bottle gates, they should clean up nicely
Here is one thread from a while back
http://soda-machines.com/discussions/index.php/topic,20773.0.html