Not too bad, acceptable in fact!
The design would have 4 sets of fins.
Oh, here's a color coded pic!
Fin set #1: orange
Fin set #2: blue
Fin set #3: green
Fin set #4: red
The posts, which are actually fin set #5, would normally taper down from their full width at radius = 32mm, down to 0 at radius 16mm. The whole fin pattern was originally designed to fit within radius = 15 mm, which takes out the posts.
The circle of fins could be made a bit bigger, it really doesn't matter, as the fins have little effect at that distance. Of course that's an assumption based on a 1mm baseplate, and since I've opted for 2 to 3mm, I'll have to double check, but off-hand, if we made the circle radius 20mm, we should be covered.
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