Looking good Brit,
Worth noting: Every valley, raised area, and imperfection will be exacerbated when paint is applied. The Phasma chrome may hide some of those or make them worse so, it might be worth consulting with a current Phasma and get their opinion on the subject. I only mention this because nothing is more frustrating than areas you thought were good to go that weren't. I've never built a costume that was chromed so I can't comment on that but I've built plenty that were painted.
Keep up the great work.