Ships often replace their parts, so their could be damage old parts from destroyed ships say the Defiant and Enterprises A and C in storage or a junkyard that could be reduced to raw materials and added to the next version. Or they could just use debris from the destroyed ship.
I love that some part of the Enterprise F will be incorporated into the Enterprise G.
The Enterprise-G already existed as the Titan-A. So it wouldn’t have had any parts from the F.
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