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The key to any success using desiccant to dewater a Boston Whaler hull is sealing the space. If ambient air enters the space where the desiccant is located it will rapidly be dehumidified thus interfering with the hull drying process.

Certainly a 13 can be sealed up using plastic sheeting and, perhaps,
Gorilla Tape. You'll need to remove the engine and seal every hull penetration for this to be a decent seal. But, if the moisture egress is solely through screw hole the process will be excruciatingly slow. The larger the surface area of the wet foam the more efficient the process therefore for the process to be efficient any wet deck foam must be exposed.

Angus told us water started coming up in the bilge trap (sump) when he removed the bilge pump screws. He certainly has some water in the hull and it's likely to be found in the general area of the garboard drain. Whether or not it's worthwhile to Angus to open up the deck and later reseal it we don't know. If he is only able to remove 14 pounds of water I would not think it was worth the effort but he may believe otherwise.

Before taking on a project I would want to know if there is a significant problem.