on my trip to contrary this year, i wasnt getting as many cons in my keene mat highbanker as i thought i should be so i took the header box off my dream mat box and ran it as a secondary "catch" box (14 inch into the 12 inch). i made a couple brackets and 2 rubber flaps to keep the water in the 12 inch box.
out of the 3 days i ran it that way, all i found in it was a some pieces of fly poop, sub 100 gold (11 pieces total for 3 days)
last pic is what i got for 4 hours down in that area, not that good but enough to bring a smile