Luke, the fin will be change for sure, just need to wait few days until Martin come back from vacation.
I know how a mistake was made, Martin scanned the rudder, but during drawing of 3D drawings, he accidentally drew the moving part smaller for space between the two upper fin rib.
This can be easily corrected...
Making a model is a process, I show all this as one story and as you see, there are no secrets. Errors are happening, and often just thanks to modelers around the world, they are spotted and removed.
Luke, I'll be very happy if you decide to buy F 100, that will be one more great workmanship, good for both of us. I'll have fantastic advertise, because you are master builder and you will have super model.