Will you be using your same colour list G? I've always thought if I were to do another ESB, I would test out adding a drop or two of black to the main back panel mix colour, to deaden it ever so slightly. And just a few other very minor things, like matching some of the greys even more accurately, and something still gets me about the red - I think humbrol 73 is closer than caboose, but for some reason, I just find the real lid's red brighter in certain lights.. Any case, I think you have an amazing eye for colour and minute details, so can't wait to see what you concoct..
And i'm always interested in any tools to help supreme accuracy, so very keen if you do a run