I think the rusted look is the best, on a Disney Nautilus at any rate.
To my eye this most accurately reflects the surface shots of the boat, in the film.
Painting is the worst job for me, I hate it and would happily farm the job out elsewhere in exchange for other skills.
I do think any working Disney Nautilus needs good lighting.
For this I favour white LED's, which have come down in price dramatically over the past year or two.