I applied three layers of 9 oz cloth to the cowl injector inlet using the previously shaped foam block as a mold. I tried the balloon trick per Van's instructions but had no luck getting the balloon to remain in place. One probably needs to use a sausage shapped balloon. As an alternative, I simply applied 1" peel ply. Regardless of technique, the inside of the tunnel is going to take a fair amount of work to get an acceptable finish.