[KCV6]

I went up to 25L (6.6 gal US) setups but stuck with the round food grade PE and PP buckets. The diameter is a lot bigger so useable plating area between the anodes is good for doing a reasonable run at a time of small parts and copes with brake components and stuff easily. I still use a fish tank pump and also a medium volume aquarium pump with some PE filter cloth to also stirr the tank. depending on what I am plating

You could try square PE or PP storage bins from a storage shop. There are some fairly sturdy ones around and they come in all different sizes and usually have lids that latch on. I have contemplated doing this to get my zinc setup to do longer parts. I would recomend doubling up on anodes so 2 on each long side perhaps.

Let us know how you go.

Cheers Mark