Little Green Man Prototype Build, Part 2, More Fins

Here's an old school idea - 
Pin the fins together when gang sanding. This is helpful when the fins are hard to hold together when sanding and trimming.

You can see I pinned the pattern right on top of the stacked fin pieces.
Go easy when pressing the fins through the wood. It's easy to split the balsa down the grain.

The concave side curve was sandedusing the side of my old Warner sanding block.

The sharp inside corner was shaped with the angled side of a diamond file.

The pins were pulled and the pieces separated.
The pin holes will be easily filled with CWF.