A very very old tutorial i did in 2005. Found it in the deep corners on the HD of and old Workstation. Due to a lot of requests i am uploading it here.
The quality of the result is somehow outdated but the process i use for modeling is similar to the workflow i use nowdays ... just a littlemore speed and Zbrush inbetweens for tweaking.
The reference images can be found on my site.