I'm getting way ahead of myself here, but in reading ahead I became curious about the rake angle of the chainplate. In the manual it says to erect the mast and figure it out from there (I guess by stretching a line from the masthead). Or to "scale it off the plans." On the plans, I extended the line from the chainplate out to about 200 mm and came up with a rake angle of about 3 degrees aft. But the drawing in the plans is pretty small, i.e., if I didn't get the line exactly parallel to the chainplate drawing it could make a big difference.
Then I got to thinking (bad idea) and realized that the mast itself is not going to be perfectly straight, no matter how hard I try, so I should wait and use the line-stretching method. But what if I have to replace the mast some day? No way is it going to be exactly the same as the original mast, and you can't change the angle of the chainplate without weakening it.
So maybe the exact angle is not that important, as long as an approximately equal strain is placed on each mounting bolt.
It would be a huge help if those who have built the boat could let us know what the rake angles turned out to be.