I rebated the window and it looks very nice, I first screwed the mold on the foam at the right place and the I cut the foam with a stanley knife. I then did the same again but this time with a piece of triplex between the mold to get more room for the laminate and the seland when the window is placed. I rebated the foam to the first cut and the rest was cut away with a stanley knife blade. The result is that you get a nice straight line.
We also put the daggerboard halfs together with one piece of carbon tape so it will stay in place when we do the other laminates with vacuum.