In case you don't know, the rabbet line is the line that defines the outer edging of the planking. At the front of the boat, the rabbet line is where the planks dive into the stem. Along the bottom of the boat, it's where they go into the keel, and so on. The rabbet itself is a groove in a solid chunk of wood where the planks rest. You'll see photos in the future if this doesn't make sense.
Suffice it to say that drawing the rabbet line is critical for building the boat. In our case, it's also critical for figuring out details of the stern post, how wide to make the keel, the shape of the floor timbers... all manner of things. So, Robin is working on the rabbet line.
While he's doing that, other folks have been drawing construction details on the lofting.
Here's the infamous body plan, now with lines showing the location of the bottom of the keel (marked "bok") and the top of the keel. Once we get the rabbet drawn in, we'll know if the top of the keel goes all the way out to the planking, or if it stops short and the rabbet intersects the keel at a lower point. You can also see the green dashed lines indicating the planks in some areas.
We've been drawing in the locations of the floor timbers, frames, keel bolts, and lifting eyes as well.
Having all these details drawn in helps us to make sure that one thing doesn't run into another.
Karl has drawn the profile of the transom knee, and here he's patterning that shape in order to build that part.
Ok, maybe if you hang around loftings a lot, that picture will make sense to you.