Do a little research, you need to decide most of those based on the tools you are using to make it.
Base size shoudl be about the same as the fin size and spacing if thats the same(1mm base with 1mm fins and 1mm channels) and the fin height should be between 3 and 4 times the width. The radius or diameter(that you have drawn is diameter) is whatever size you want to fit everything in(watch the size of hosebarbs and hoses).
Jon
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