Modelling the hands

Now, I need to work on modelling the hands of the gorilla.  I haven't done much hand modelling in Maya, so I may need some reference on how to model the gorilla's hand accurately.  I've just got this image off the internet to use as reference.

I've also come across this tutorial http://plissken.fatalunity.com/tutorials/subdiv/step1.html, so hopefully I should be able to model it without too many problems.