1973 V20 Transom Repair?

[Macrenovations]

Thanks for everyone's help so far this old girl needs it. After getting in to it a little more today. I drilled a few holes to see how far gone it was.To my surprise the wood looked like wood but was a little wet from the top cap not being sealed right. Wanted to see what everyone else thinks. To me the transom looks like it was already replaced and not that long ago. I believe they removed the top cap and I mean the whole or at least half of the top of the boat which would explain the other cracks on the top port side.The only movement I get is about an 1/8 play on the starboard side where they did not glass over just filled it with silicone the port side had a little glass work done but not that great but no movement. My main question is should I just rebuild both corners of the transom and drain pan.In the one pic side view of the transom you can see the top 4inch or so is inset more then the rest all the way across even in the center notch is this normal or should it be the same thickness all the way. See what you think....Thanks