Hello, i also search this one in new or a replacement, but its really hard to find. Nobody has one...
I had to do a big repair on my because of the cannon. But now its fixed for years. If you want to check how i made that here is a link from a german forum. Check the pictures, it will help to get an idea.
https://www.flippermarkt.de/community/forum/threads/plastikwanne-cirqus-voltaire-gebrochen.219743/
Hope this helps...
Greetings Daniel