Is that masking on the front and back of the engine nacelles? I do agree with the comment about the Battlestar meets 1950s-60s vibe, it does have that. So, perhaps silver, or polished metal, with brightly-colored trim suggesting speed? Say, something along the lines of Lufthansa markings from the thirties, with the lightning bolt along the fuselage, trimmed in red with yellow outlines and the nacelles done similarly.
For example. take:
The nacelle lightning bolts could run just above the wing or split and run just above and just below the wing or run along the top and bottom centerlines of the nacelles.