Dude! That looks REALLY good. You stole my idea, though, of adding an additional lip of sintra to the back edges! 
Seriously though, I'm glad to know that works in practice. In my head, it was just theory! Once you rounded the edges like you did it really looks like a single, thick sheet.
The paint on your bells looks fabulous. :love Did you paint all this by hand???
Where did you get your decals from???