I believe that most CS 36Ts were produced with the opening ports - a few very early models had bonded deadlights a la C&C and others. The brand of ports used likely varied over the production run. I think there were more of the 33s produced without the opening ports. I've also seen both versions in the newer CS30
There would be obvious ventilation advantages with the multiple opening ports over the bonded window style.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)