ports added to non-port p-16

I notice on the slo site an image of a p-16 with ports added.
Does anybody know what size ports they are and what the process is for adding them?
See the image here: (the boat is also in the video)
http://www.slosailandcanv…amaran-Trampoline/Detail

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Rob Jones
1976 Yellow p-16 - parts is parts - hulls cut up
1978 Yellow p-16 - in good working order
1979 White p-15 - parts is parts - hulls cut up
1985 White p-15 - good working order
1982 White NACRA 5.8 - project boat.
1986 White p-16 - in good working order
1975 White Hobie 3.5 - PM me if you want it
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They are 4" curved ports added because he probably took the gudgeons off for painting the boat. When you do (don't ask me how I know) sometimes the aluminum backing plate falls to the hull bottom. Ports or a pumpkin lid cutout necessary to reach in & replace that plate. Murrays carries them & I probably have some old white ones. Pete
I wonder how well they work - I really want more access to the inside of my hulls - i think there is a ton of sand and bay grass stuck in them.

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Rob Jones
1976 Yellow p-16 - parts is parts - hulls cut up
1978 Yellow p-16 - in good working order
1979 White p-15 - parts is parts - hulls cut up
1985 White p-15 - good working order
1982 White NACRA 5.8 - project boat.
1986 White p-16 - in good working order
1975 White Hobie 3.5 - PM me if you want it
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