Ed
Here are some of a Hugger Norwood car I did. And one shot of a Nova for grins, the Nove shot shows the undercoating detail pretty well.
If you are doing the overspray thing to the floorpans, the floor plugs should be in place for the final body color, I forgot that on this car.
Also do not try and do the OS with base clear, have a pint of Single stage mixed up and use that.
Mike
What color is you Zee ?