I'm gonna say no. The V-20's do have large holes drilled in the left and right side stringers but water can get to the outside of the stringers through the hatches on the back, rod holders or open rod boxes. Looks like on the Sun Hatch that area may be sealed completely and probably filled with foam so if there is no way for water to get in than there is no need for it go get out.
My other concern is if that is truly the way the boat is constructed I would be afraid that if you did drill some holes water from your bilge could get in there and start soaking your foam.
I'm not 100% sure about any of this based upon that one picture and never having seen a sunhatch up close.
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1986 V-20
1986 Yamaha 150 HP
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