Did this yesterday in a few hrs using Blender and the new realtime renderer Cycles.
Having the renderer working while i modelled was amazing.. i could see what i'd just modelled displayed in full GI(global Illumination) within seconds of having modelled it! final render was done with 200passes.
click below for the hirez images
for more on Cycles and how to get it, see my last post about Blender http://my.opera.com/chaitanyak/blog/show.dml/30471242 you'll find a quick "how to" on setting it up and using it.
and heres a hi-speed partial recording of how i built the model, and what fun it is to watch it rendered in realtime as you model.