For the armor on your chest, that is the only way I'd imagine doing it as it's a good point of reference.
As for the neck, you don't have to use foam as you can use fabric. It's just a matter of finding the right fabric type and painting it metallic silver.
When in doubt, just take the next small step.
With that next step take a deep breath. It calms the mind.
When the mind is calm you realize the best is still yet to come.