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That looks like it could work as long as your mounting bolts are in the original transom.
3 inches thick is a lot. Most transoms are 2". It could be this way because of adding to the height or...

I took a look at the photos on your blog. The first thing I would do is sand the paint off the front of the transom. I can see a line that runs across the transom at the cockpit side height. This may...