It took me a while to complete my project too. Between work and a 1 yr. old daughter it's been a busy few months.
I went with the simplicity is best route for my assignment. 1 class diagram, 1 component diagram and 5 sequence diagrams (1 or the 4 appeared to need it's own alternate flow). I had about 3 pages of assumptions. Some were of a design nature but most were explaining my interpretation of the requirements - which is turn should be self explained with the diagrams.
But of course I don't have my results so using me as a guide would be very risky.