Image 1 shows the clearances around the rocket. Image 2 shows the installed blast shield held to the canister with two #6 screws. These only need to hold the forces for a fraction of a secondImage 3 shows the rivnuts inside the canister. Shorter screws will ultimately be used.
general clearances
two #6 screws hold the shield to the canister
rivnuts...shorter screws will be used on final install