This seems like the best idea. I bought my stripes off of challengergary.com They look good but I only unrolled them to check them out and put them back into the box. He marks the demon side stripes L and R which is why you see some drooping down the fender lip when they are on the wrong sides. His kits seem to get good reviews and he had great service and prices.
I do trust my body/paint guy to make it look right. I gave him printed photos marked up with pen showing how the driver side hood stripes hit the wiper pivot then run paralell to the hood line, then measure PS to mirror it, also how the tape stripes wrap around the edges. I don't know if I need to make a template to give them for the blackout or if that's too hand-holdey and I should let the pros figure it out?