On some
windows i'll see where this could be helpful but on most banner installs it goes with the window well IMO
what does this mean? goes well? ...what goes well a rectangle? a curve that was made without a plan? ...exactly what are you telling us here?
I'd do it ike Adrian suggested. My last perf was on a Scion & I used scrap
paper from the laminate waste & got it flat on the window, forcing a crease where the glass met the rubber trim, & I ran a pencil to that crease making an exact template for the top curve. then I cut this in the
paper, checked it on the window, taped it up & made my pencil lines on the bottom & sides.
This was for an already printed job that didn't have to match that curve, but it still converted the 3D reality that looks straight across on the top, into a 2D curve that would be the one to match if I had typesetting to do.