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Cupboard was probably the worst word I could have used to describe the area. On my 1979 I used a 4" hole saw drill under the dashboard on the starboard side of the molding. My little teak cabinet under the dashboard is completely intact. My cabinet is now removable. I cannot pull up the picture you posted. I will take another look at mine and get a better layout. It has been a while since I ran the rigging through there. The nicest detail is that the steering cables (I since changed to hydraulic steering) swept down from the gunnel instead up up from the rigging tunnel. I was able to get rid of that big loop as it came out of the tunnel and then continued to the motor. I got sold the cables and do not have a measurement for you.