[Ed]

Hey Brian-

I would wait. Here is why...

The bond between the inner surface of the transom and the first new piece of transom core is very important. If the first piece of core is already laminated to the second piece of core, you'll have a much harder time of pulling the new core tight against the inner surface of the transom.

Bare plywood will bend to match the inner surface of teh transom when you temporarily screw and clamp it in place while you're waiting for the resin/glass to cure. If the plywood is already laminated with glass and another layer of plywood, I think it would be very, very difficult to get it to snug up tight against the inner transom surface.

Hope this makes sense.

Ed