I hope you don't mind my input.. I know this isn't a build thread but I thought I could help as I've spent a lot of time playing with chrome paints. You can spray a 2K over the chrome and keep much better reflectivity than with any rattle can clear. Use a 4:1 clear thinned with 2 parts IPA, and force dry. It won't be a perfect mirror finish obviously, but it's just about the best I've found. For the sandwich, you mentioned 3 visors? One tinted black visor with chrome sprayed on the face, and one clear to cover that, should give you great visibility and offer ample protection and I believe it's how they did it for the film.
I see you are in Florida as well! Perhaps we should get together sometime and sling some paint. I've bumped into your work a few times at Reynolds.
Hope this helps somewhat.. best of luck with your run! :thumbsup