Here's another surfacing model I've been working on in SolidWorks. The outer surfaces are super clean and it's all about the input curves. They have to be continuous and really smooth.

Of course Sub-D modeling is all the rage right now and would be a great tool for this model. But I haven't found a really good way of controlling the parting line which ends up being really important for a manufactured part. I haven't fooled around much with Sub-D yet so there is probably a slick trick I can learn.