I spent a chunk of this afternoon writing very rough outlines of the chapters I need to write between now and the end of the book. I'm not 100% sure if they're in the right order and they may still need a bit of a shuffle around but it's helped me clarify the direction I'm going in. After originally worrying that my story wasn't full enough to fill 90,000 words I'm now thinking that my story is too complex to fill that amount of words and I might have to cut a character (one that hasn't been introduced yet so it wouldn't be a problem) so I don't create too convoluted a storyline.
Although I don't know the order that the chapters and scenes should go in I'm not worried as the novel seems to be progressing quite organically so far and, once I'm actually writing, I instinctively know which scene comes next.
Tonight I wrote over 2,600 words and a scene that I originally thought would just move the action forward and be fairly straightforward actually became quite traumatic for my MC when a character I hadn't originally planned to be in the scene showed up and caused havoc. It worked really well though, far better than my original plan and also helps tie in a scene that comes later so I'm feeling pretty pleased with myself right now (will try and hang onto that feeling, they don't happen often!).
So, over 40,000 words written now. Only 5,000 more and I'm halfway.