Looking to build a flood table

I am looking to build 4x4 flood table.

I will be folowing Al B. Fuct's harves every 2 weeks.

Rather than buy 4 trays, i wuld like to build them myself.

ll of the guides i have seen look a little flimsy, and i am woried about the table "sagging" during the flood cycle.

Anybody hve any thoughts on building a durable flood table?

Make a system out of the guides you have seen if they sag it is as simple a making a extra saw horse and placing in the middle.

i dont know if i can do that, because i will be having the res in the middle