plumbers,carpenters, need some help

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Yea I know it's a big hole but I went about 11/2" -2" outside the bad stuff to make sure. I am going to scab some pieces on on the right and left sides. Don't worry about the saw cuts that went over at the corners we're getting new flooring in a couple of weeks. The dog murdered the vinyl with his claws so Lori said she wants new floors,kind of a hard vinyl that looks like ceramic tile. We were told the dog couldn't hurt it. Thanks for all the help guys ,but then again this is FABO so I'm not too surprised.