Hi Chris . The tape goes on the canopy ,turn the led torch ( flash light ) on its end ,light up , the light shows through and shows the out line of the frame " the pencil" is used to mark the edge of the frame and window , cut the outer edge of pencil line NOT ON the line ,you have seen the result , I hope that helps
If you look at die cast models the frame paint is above the actual window/frame meet That's what gave me the idea !!!!
Hope that's clear
Skeater