I'm modifying the forward cabin now. Ripped out the starboard side bunkbed and bureau, then added plywood base to turn it into a full v-berth. I narrowed the triangle area by making the starboard side of the berth wider. Although I haven't completed it yet, the plan is to hinge the triangle filler to the starboard platform. When it's hanging down, it acts like a cabinet door to the small stowage space there, and when I want to go to bed, I just raise it up and secure it to the port side with 2 long sliding bolts.
That's the plan, anyway!