Can't help with the underfloor but do you have room forward to weld up a stainless holder to the ribs centrally? Can put another 24litre tote tank in there and run the fuel line under the floor to a 3 way brass fuel tap down aft (I just like saying that). I have that in my 4.5 Bluefin and it works well. Gives it more weight in tbe bow to even her out to. Cheers
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