WOW, that's more skillful than I think I would have been, Tim - VERY impressive!

The best idea I've had so far, for such "oil-canning" was to tape over the frames with strips of aluminum HVAC tape, then sand the whole area: the tape would protect the framing pattern, while the areas in between would be hollowed out. Far better for much smaller-scale builds, though - doing it at 1/72 like you needed would be far more work, and probably far less effective.

Bravo-Zulu - and a very interesting tip - Tim!

Cheers,

- Matty