Do you include the concrete that squeezes out under the frame as part of the depth of the concrete driveway?
You would measure the thickness, from the base to the top of the form. If the form was an inch off the ground that extra inch is part of your new slab. It just dosenot look as nice unless putting a lawn next to the slab. I have done things like this but usually back fill because the concrete that gets out is a waste of $.