fish "butt crack" template, guidelines

So I’ve got a decent 5’ 11" fish template (similar to a Steve Lis), w/o butt crack. I’m going to freehand the swallow. Are there any general guidelines I should follow? I’m going to start the swallow about 7in from tail, does that sound about right? Any advice for doing my rail bands within the swallow portion? Toe-in of the fins … are fish fins pretty much perpendicular to the stringer?

Look in the archives under “butt crack” loads of info