Thank you ace. I really appreciate your compliment. And, yes, I did attempt that (the 45 degree-rule), though, being devoid of all scientific tools, I had to measure it in my head and thence apply it. Glad you find it acceptable.
As for white, it is, as Hood says a pain, really a major pain in someone's hiney!
I have done my best to represent it, with different hues of off-white, tapering to a more yellowish tone, as you correctly have noticed. I have studied colorite photos and paintings of these ships extensively, and I think I've managed to capture those hues well enough.
So, enjoy your sandwich, my friend!