On the first page of my helmet thread I show the relatively simple way I cut my stencils. The proportion of height to width
is solved by sizing one or the other (height or width) to the area you're working on while keeping the entire stencil inside the working area.
This ,for the most part, establishes the size of the stencils design.Next cut through the broadest and least detailed areas of the design to increase
it's ability to expand and adjust to the edges it was short of when sized. There are some pictures of how this worked on one of my helmets back
panels. This worked well for me on all areas of my paint up. I think it might work for most helmets. The slightly added space in the broad color areas can hardly be seen if at all.
