On my boat...the veneer is/was 4 plies.
The teak plywood underneath is probably 1/2 inch and the veneers made it nearly 3/4 when all glued together so don't be surprised if it sinks in a 1/4 inch or maybe a bit more the stops dead.
I only had 2 or 3 spots under window corners that the plywood was rotten all the way to the thin glass covering the house. The aft end of the master head window spread from the side of the aft cabin side to the athwartships bulkhead forming the after part of my head.
It was no big deal to use a multi tool to dig it all out and epoxy blocks o ply in. The bulkheads need new covering so neat joiner work for the bulk repair wasn't necessary.
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