Back in August this guy bought a white i-miev to make a golf cart out of and took all the doors off of it. Maybe you could write to him and ask him if he still has the doors and if he wants to sell them.
Check with the dealer that bought my wrecked I-MiEV in Deland, Florida. R.C. Hill Mitsubishi. He should have a good complete white passenger door. (sorry the rear door didn't make it)