I managed to add the ribs. There is more framing to go on the model. Looks a bit complicated, but it's probably not as difficult as it looks.
I did have some difficulty keeping track of all the small rib parts. They're all different, and are shaped to fit the clinker-style hull planking. Unfortunately, with things this precisely engineered, the modeler has to build it just as precisely or things don't line up exactly.
My hull planking is just a tad low, by abput 2 millimeters or so, but I don't think this will be a big problem in the end. It's just that if you look really closely, you can see this as yet another imperfection in the build.
On the shelf, it should look pretty good.