I've done it! Actually it was done two days ago but I've just tidied it up and sent it off for comment. So I've succeeded in my task.
Things went according to plan last weekend. It only took 6 hours of work on Saturday. I worked from 9-12 and 2-5 and it was done. Luckily for me much of the writing was thinking without reference to articles so I just got on with it and the time went quite quickly. All the plans I set for myself worked fine but the key was getting started on time on Saturday.
I've very proud of this achievement as previously I would have been staying up until 4am on Monday morning to get this done.
So now I wait for feedback and hope I don't have to completely rewrite it.