robn1
Master Member
The b&w hero fins should look just like the midgrade type, just lines scribed into the surface. Here's the best view I know of that shows them on a b&w.
You could do it as a stack of styrene sheets, alternating the width so one is flush with the surface and the next slightly under.

You could do it as a stack of styrene sheets, alternating the width so one is flush with the surface and the next slightly under.