You have likely already seen Erik Zwaan's excellent build report of the new F7A locomotive design:
F7A Santa Fe Diesel Engine (O-scale)
I will be doing a test build of the secondary locomotive, the F7B. It's part of the horsepower, but without the characteristic nose. This is also a brand-new design by Cor van Haasteren.
I have printed the PDF on 180-grams paper, and used 1mm greyboard for strengthening of the internal parts.