Sven,
First off, for your NFM
ports, you need a tap of the right size to clean up the threads in the trim ring studs. Also need to clean the bedding surfaces with acetone to get the
oil off.
I'm in the middle of replacing the 6 opening
ports on my boat. Probably next year I'll get to the fixed windows (here's what an
Irwin 39 looks like
http://www.irwinyachts.com/aft-cockp...t39/C39pg2.jpg).
Because of some structural issues, I'm probably going to reduce the size of the openings.
For your fixed lights, you might want to consider glassing over the openings, cutting new opening using something
current that has a compatible shape.