When I installed my deck for the tank I trimmed the bottom edges of the deck on a angle so most of the support was resting on the hull but the top of the deck was flush with the stringers then I glassed the deck to the stringers when I installed it. You will not have much room from the top of the fill hole to the bottom of the hull deck where the CC sits so try to make the strips of plastic as low profiled as possible with leaving enough room for ventilation as you can. You might want to first pre set everything in place to confirm you got enough room that the fill hose does not push the bottom of the deck up and it rests on it instead of the lip of the deck on the port and starboard. I did something a little different that most guys. I filled in the vent holes on the sides of my boat which permits air to circulate in side there. So I set up a vent inside my center consol for air to circulate around my tank and out through two small vent holes on port and starboard under the cap by the transom this is also a access hole for me if I ever need to go back in to mess with my connections or my tank fuel gage sending unit. If you don’t have enough room you could set up a vent or service hatch over the area that rubs.
FellowShip
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Just for the Grins