You could screen the holes, but gooing over the holes would do you no good. If you race any ROAR speced events you may just want to pick up a JConcepts or proline flotek that have cutouts for holes as I've heard that ROAR only allows for holes that are "intended" to be cut out. If just for club racing, the take a look at one of those bodies and copy on to your truck. I think the most important venting is in the back right behind the roof, then the front wheel wells to prevent air from standing the nose up.