Ok. There are a series of interconnected problems at the bow. Consider the bow gunport as the fixed datum point, because it is there and it is a hole. Yes, it's in the right spot, they were pre-punched in the bulwark plywood. I kind of wonder if that gunport was added in later because there is no cannon supplied for it and I would personally hate to have two open gunports right in the bows letting waves in all the time. Just me. And having it not there would solve a lot of problems. If I built this ship again, I would just plank over it and omit it. Did cutters really have the spare gunport? I can't see them hauling a 3 pounder up to the bow for use as a chaser. I'm curious what people know about that feature on HM cutters. And I think when I have the windlass and bitts in there there won't be room to swing a cat, much less a cannon.
The first problem is that the breasthook is way too big. It covers part of the gunport. The slot in it for the stem is also about 3mm deeper than I needs to be. Now the question is how much smaller to make it because there is another problem.
The catheads can't go anywhere near where they are shown on the drawing. And they are shown in at least two different places. First of all, the breasthook takes up the same spot. If I make that smaller, and I will, the catheads still block the gunports. It is like the draftsman saw the conflict and just judged it. It happens. It shouldn't.
In the first picture, you see the problem -- the breasthook fouls the gunport opening. You can slow see how big the stem slot is. You can also just make out slots for timber heads above the gunports, in the railing. The aft edge of the slots and aft edge of the port align.
In the second photo, a plan view from the drawings, you see that the catheads are supposed to be just forward of the timber heads. Which places them right in front of the gunport. Well, at least less seawater will come in there will the cathead half blocking it. And once again, there is no room for the cathead with the breasthook coming back into the gunport.
In the 3rd photo, the draftsman accurately shows the upright of the cathead right in the middle of the gunport. Or it is implied -- because that would be a problem, the lines of the cathead are not drawn in although they would be visible through the gunport by mist drawing conventions.
In the 4th photo, from the box art, there is an additional solution-- the cathead has been moved well aft of the timber head and away from the gunport. I think this is what I will do. I was concerned that the catheads would end up to far outboard, and they do crowd the anchor a bit, but the only alternative is to mount them forward of the gunport, and I think that is too close to the bow. It doesn't look right.
Another odd thing is that, looking closely at the catheads in the box photo, the builder didn't sand off the dark laser scorched from the sides affected. Seems like cutting corners in an odd spot.