I'm not trying to argue, just stating that having a fabricator build a few tanks with a shape like that is going to be $$$. its not an easy shape to replicate and would require a talented metal worker.
it would be cool if someone here has a contact/hookup to an injection molding company. do a group buy and hopefully if there is enough interest, do more, or keep a stock of some.
https://www.plasticomnium.com/en/aut...l-systems.html