Fish cleaning on board??

[bigeasy1]

Anyone out there clean their fish on the boat?,and what kind of setup do you have?
We want to start to clean our Salmon on the water,as the cleaning stations on the lake are always mobbed with charter boats cleaning their catch's and the wait is long.

Most of our salmon run from the mid teens to high twenties,so we'd need a board big enough to be able to filet them on.
We tried putting the 125 qt.cooler on top of the I/O motor box,and filleting them on it,but it makes a mess with blood all over.
I was thinking of some type of cleaning board that could go from the top of the cooler to the rear of the transom cap with a very low lip on the sides so we would be able to get the fillet knife low enough,but be able to use the washdown to rinse the blood & guts overboard.

Any ideas?? or pictures of your solutions??