Hope they use some good o-rings in those boosters.There is no external tank to be breached and detonated on a vertical stack approach.
And the O-rings were fixed after Challenger. And even now, just to be extra-safe for the shuttle, they launch only in warm days so the material is at its most effective to seal...
is it just me or is it odd that the SRB joints have an upright "U" for the joint so when the solid propellent passes by the joint, it is burning DOWN INTO THE JOINT where as if the "U" were UP-SIDE-DOWN... as the propellent burns it's way past the joint, the O-Ring is untouched.