Happy to see this happening. I'm putting an initial document together for Scott with regard to late era Red Nose E5s. Since the tooling was made for Phase II engines, I assume red noses will be Phase II as well. Thus, I will be recommending Phase II engine names and engine numbers ensuring more prototypically accurate models.
E5 boosters had my differences between red and black nose timeframes. Some included: E5Bs behind Red nose engines didn't have skirts, had nameless plates, had vertical E5 plates and different markings throughout.
Notice that phases apply to E5A units only.