Yup, C&J for your bimini (they did all the canvaswork for Opal during the early 2000s, so will have a template for your boat.
As far your other question, you can only pull a certain number of boats out of a set of moulds, and back then, Bavaria were making around 5,000 boats a year, so it didn't take long for the moulds to need replacing. I guess that, along with the "sales and marketing" that comes with having a new model, is why there was a regular turnover of models back then. They only made my one for just over a year, although in that case, they kept the hull the same on the subsequent model, and just changed the deck and interior.