Desinging blocks question

Now that i finnaly have AutoCAD02 at home, ive have begun desinging my first waterblock...

Ive read up alot and have look at other people desings, but is there any obious things i need not to do??

Along the lines of horrible flow, horrible ideas, you get the point.

Right now, im working on a sort of 2 barb WhiteWater... but who knows how many times my idea will change.

Post some pics and we will be able to critique your work better. I'd love to attempt to make my own blocks but I don't have the nesessary tools.