Could the earlier Iowas receive the later torpedo-defence arrangement?

In a no-expense-spared rebuild, could the earlier four Iowas receive the torpedo-defence system of the later two hulls?

Yes, under that unrestricted rebuild assumption; no detailed conversion scheme is supplied.

Under the no-expense-spared rebuild assumption, the earlier four Iowa hulls could receive the improved torpedo-defence arrangement associated with the later two. The feasibility is accepted in principle, without a detailed conversion scheme.