manufacture appropriate width strips of 1" polypropylene or starboard material, countersink 1/4-20 flatheads with fender washers/nuts under the deck, then attach your console to the flange in the same fashion, going all the way through, (pretty much what Lew said) do you have a pie hole under the console to get your hands under the deck and work? Or is there not enough room between the tank and the deck??
