As for the interior of the portlights being dry, in theory yes. However, if you are installing solid bronze, through-bolted portlights, be aware that the interiors will "sweat" when there is enough interior/exterior temperature gradient. These portlights conduct both heat and cold, so in the winter will feel quite cold to the touch, leading humidity (from our breath and/or the propane stove) to condense on their surface.
I have 10 bronze ports and they sweat like crazy in the winter when its nice and toasty down below and frigid outside. Sometimes they sweat so much they drip.