Well I ran into a little snag using AutoCAD for this part. It seems it's just a little too complex to try to use AutoCAD to make this part, and still have any flexability to go back and make changes.
I had been trying to find someone that knows ALLOT about Solidworks for about 6 months, but kept running into a wall when I asked them about complex lofting, and surfacing. It seems not very many people have gone that deep into the program. Squares and circles are easy, but compound curved surfaces are a little more tricky...
So I decided to take the last week and teach myself one of the hardest programs I have ever tried to use. I have to tell you, if you want to drive yourself insane, sit down with a copy of Solidworks, and start practicing
The 1st few days I started to feel the need to hurt small children, and cute little helpless animals. After 3-4 days, I was feeling the urge to stab someone... anyone in the neck with a spork. But then on the 5th day.... things went back to normal, and now I only want to hurt myself again, which is good (I think).
So, here is the NEW base completely re-drawn from scratch in Solidworks 2011
It's probably hard to see, but note the 3-degree draft on every surface to allow for the master mold to be pulled from the sand during casting.