I know of an even simpler CAD program that renders in 3D and is designed for making small machined parts. Its the CAD program from emachineshop.com. I don't have a CNC and my access to one is limited. I found this program on the web about a month ago and have been designing my waterblock on it since.
If you actually want the machine shop to build it for you, you just email'em the file of the drawing you made. The software will also estimate, analyze and price the piece you want made, based on the quantity of the part that you want. Lead times are a big factor. Machining a block like a Antarctica would cost about $80.00 for instance, if you are willing to wait 30 days for it to be built. If you want that same piece in fourteen days, its $400 and change!
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