complex mold design problem!!!

I can not figure out the best way to make this female mold.  I have given up on the mold tools and I am now looking at extrudes, combine (add, subtract), surfaces, etc....please let me know what you think the best route would be.  It will probably end up being a two peice mold, i just figured i should model it as one for now and then divide it afterwards.

Thanks,

Solidworks newbie

SolidworksPlastics And Mold Design