I think if I had the urge to paint one, I'd hunt up a 66-16 that was a dog externally but sound mechanically for the job.
I'd strip it down to the bare metal, then paint it OD green. I'd have the plated parts stripped and I'd paint them flat black. Then I'd use the black SINGER MANUFACTURING CO and SINGER decals on the arm, leaving the rest of it without decals. I'd then clear coat it with mat clear coat.
Then I'd get a dog of a case, repair that and cover it in camo pattern cloth. I'd also have the metal parts stripped and they'd be painted flat black as well.
THAT would be a cool machine .... In My Not So Humble Opinion.
Joe