Finding big plastic containers that are sturdy enough to support media being flooded and drained is actually a really tall order.
I've tried to get some quotes for 200 gallon grow beds (about 4' by 8' long) of 12 inches deep and it would probably cost between $16,000-$24,000 just to get the molds made and then the cost per bed would still probably be $200-$500 depending on which company and how many beds ordered. And then there would be the support structure if the beds are not resting directly on the ground. And there is not guarantee that those beds won't need extra support to keep from bulging.
This is why most commercial operations are raft beds on the ground since you can build that with liner and frames which is much less costly.
I suppose if you get really heavy duty liner and termite proof frames, you can do media beds on the ground built with liner and frames. Trying to flood and drain large beds like this with use of siphons may be nearly impossible unless you can drain to some sump tank placed at a lower elevation since siphons like a bit of drop to function smoothly. FLOUTS may be a bit better for such a purpose but you still have to drain down which gets tricky when the beds are on the ground.
Just a follow up, I did get an A and I decided to use totes side by side. Thanks y'all.