Tricky parts starting

I was right, it gets harder. I have just been trying to cut corner knees for the  stern. Really difficult as there are no fixed lines or angle to use as references. I have chewed up a couple of pieces of wood already. I think I will have to cut down the temporary extension to the transom earlier than I planned in order to be able to fit something. But I will get there. I am planning to paint the boat completely, so should be able to hide any dodgy joints.