VETTE ATTEMP'S UNDERBODY...
I first filled the 2 areas near the front wheel wells with sheet plastic. Then I cut out a piece of sheet plastic for the Underbody and carved on it untill it fit Nice & Tight.
I decided to cut off the raked end of the Underbody ans attach it directly to the back of the body.
I cut 3 little Tabs from strip plastic and glued them in place to hold the Underbody in Flat for gluing.
Here is what the Underbody looks like in position...