Sorry I'm not sure if I fully understand your question. Essentially you're trying to cut masking film ? Yes ?
If so, just make the shape you want in illustrator and cut it.
You can't template the shell too accurately as the stencil will deform as it's moulded to the shell and unless you're very familiar with 3D software and unwrapping 2D surfaces this is near on impossible, and even if you do understand 3D software a package that unwraps this kind of thing in a way we can use for masking as opposed to just a polygonal flat that can be painted over in photoshop is another thing altogether.
Most of the guys on here use liquid mask, find a centre line on the shell, draw half a design, trace it off, flip it across and then draw on the other side of the shell and cut it out by hand. I do this too but then I use masking film for logo's and effects with shapes and stuff which is where the cutter comes in.
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