Hi Philip - That was the color set that just "felt" right to me. I built a PM #7 as well and fell into the same color scheme. I'm trying to go a different route for my next engine, just haven't figured out what that would be yet.
I must admit i think it is a winning combo and looks good on nearly every engine, i'd be interested to see how you get on with the CMS beam engine kit since i've admired those and will probably get one myself at some point down the line.