from our reference of fences and gates which was thick cast iron
the bar that runs across and fills up to the down pieces would state its a thin mold from the crucibal that they are holding
taking note of each crucibal they they are holding each lets say isnt enough material even with 4 men pouring to form a proper sized/thickness fence or gate
watching the video the side bar to the down bars soon fill up with the cast material with just 2 men pouring into the mold which would take 3+ pouring