The build manual was telling me it was time to cut out the openings for the portlights, and I could ignore it no longer.
I got the jig saw and keyhole saws ready, but before I cut into the hull I made a test fit on a piece of scrap MDF to make sure the opening was the correct size and a good fit.
Here is the hole made in the MDF.
And here is the portlight fitted into the opening.
It was a perfect fit!
So now to tackle the boat itself ...
I cut the first opening, partly with the jig saw and partly with a keyhole saw.
A cordless drill and a Spiraband abrasive cylinder were used to sand the hole to its exact shape. Here they are.
It was the forward hole on the port side, and here it is finished.
I discovered that it was a touch too small and needed to be made a fraction larger when fitting on the boat, so I opened the compass a fraction and remarked the openings on the topsides.
Like this, on the port aft opening.
I had also found that the jigsaw was too unwieldy here, and the keyhole saw was perfect when used with multiple access holes.
So on the next opening I drilled lots of access holes and quickly cut out the porthole, as here.
And here are the finished openings on the starboard side, with screw holes drilled for the fittings.