If the CG is where you start and the roll axis is considered tangent to the flight circle, that puts the prop and the 'rudder' at a very slight angle out.- rudder's angle about twice as great as prop's . This calculation relates to straight lines not radians. (IMHO part of 'springiness' sensed includes the difference in pull as we apply more force on one line than the other to move the surfaces for control input...)
We know the length along that axis from CG to, say, prop and 'rudder'. Even on small stunters and shorter lines, THAT makes very small angles. Of course, any built-in offsets add or subtract...
How important? These angles may be smaller than errors in construction or estimated line sweep angle reaching the leadouts- which also may vary depending on presentation to wind..