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i think the typical size would be about 4-5" wide and about 6-8" deep..height of the bulkhead will dictate how much drop yo have in the box...less drop = less noise...
that said i would likely put the BH at a level where there would be no more then 1.5" of drop from the top of the weir to the water level inside the Calfo...provided your pieps are sized to the flow of the QO4000 then the water level in the overflow should be pretty much at the top of the BH...therefor the top of the bulkheads should be about 1.5 inches below the top of your your weir...you may want to drill a third bulkhead and cut one side of the elbow off to about a 1/4" or 1/2" and upturn it as a very noisy backup drain to indicate there is a problem should one of your drains become plugged...
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