A while back, a mate of mine got a sidecar chassis for a Z650 project. He mentioned there was another, bigger chassis on the same scrapheap, so naturally it turned up in my yard today. Can anyone identify what it might be? As you can see, it is about as long as the BMW, and very solid. I'll restore it, then either find a suitable cheap hack to glue it to or sell it.
As these two pictures show, the inner rail is bent slightly. I don't think it is meant to do that, hopefully it'll come out OK.
Edit: Just found a number stamped into the rear RH lug-B8 2008