Bondo aint gonna cover that hole.

I have been trying to think of a nice way to fill up that hole myself. I bet it contributes to the road noise in the cab a good bit. I am sure it could be filled up with some sound deadening and then covered up with carpet or something else pretty easily.
Once I decide if I am going to replace the cab in my 71 F100 with my spare cab or just fix the stock one I will finish the sould deadening in the floor and the areas we are talking about.
clint