I seem to remember a thread about a metal insert that could be had from JCWitney, could it be something like that but welded?
My coupe has a metal top but it is a 60's era mod. No coupes came with metal top.
If I wind up with it I'll pull the headliner out and take pics of the top from inside. Hopefully, someone with a ccpu with a metal top will have some to compare it to.