Had some time away from the build this week while I waited for my Nautilus Models flood vent templates to arrive. Having them almost makes this fun,,,,almost.
Peel the templates off the backing,sprinkle a little baking soda on them to lessen the adheasive grip and apply to the hull,trace with a fine sharpee
and remove and reapply template back to the protective backing for future use,
Rough out the holes with a burr or drill,file a little till the D@E supplied sanding mandrels begin to enter, than sand till the mandrel slides through
I found that flipping the mandrel 180 deg. while sanding helpes keep the hole symetrical also keep an eye on things so the holes stay aligned
Steady as she goes. get comfortable and try and enjoy this process.
Thanks Greenman for the reply, I like the look of your seaview build.