Tsunami transom replacement

[warthog5]

then simply put a big limber hole in the center keel near the transom and place your drain plug off center a bit. I think the keel should tie into the transom. On the core, I've always made up the entire core first

It will be easier to do and get a good bond with the 2 sheet's of plywood laying flat.

If your putting a transom cap on the boat and I assume you are. It will be much easier if the transom core is cut down at the top, below the outside skin the thickness of the top cap core with the proper camber cut in it.
The creates a shelf for the core to sit on and have a even bend to it. It also helps so that the cap matchs the washboards.