Mmmm, well making real world design observations here.
Yes, overkill, as those turrets are already pushing the carrying ability of the hull and the raised mounting position
of the aft one is a metacentric height horror-show waiting to happen in anything besides a still mill pond.
As to a vertical launch system in the bows, I guess you're talking some small missiles as you really don't have much
'real world' space between the keel and deck. On the 80' Elco the deepest point forward, measured from the baseline
which was 6" beneath the keel, was 130", so for your half-size vessel it's 65", from baseline, 59" actual and that's an
outside moulded dimension, by the time you factor in structure and sheer you'd be lucky to get 48" vertical space
at the deepest point ... but that is at the centreline, you quickly lose room as you move out.
Take the dimensions on the following and halve them for your boat.