The leading edge angle looks right, the only observations I would make is that the root looks a little short and the trailing edge looks a little narrow. The fin looks to be a 45 degree right triangle with a tab on the trailing edge. The images seem to show that the trailing edge is one half of the span before the cutaway to clear the motor, then about 1/4 of the trailing edge to build in the angle to the inner blunt edge. Simplistically, a two inch span fin would have a one inch trailing edge, 1/4" angled section, then a 3/4 inch span to the root.

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