Ok this is what I found, not to bad all things consider. The front transom plate has a little bit of corrosion on it but its superficial. It looks worse in the pics. I’m just going to clean it up and hit it with some zinc chromate primer and a coat rustoleum.
The wood on the other hand was pretty bad. I didn’t weigh it but it’s heavy. It’s been drinking for a while. The core was two pieces of some type of ply, one piece was 1inch and the other ¾ I think I’m going to use yellow pine; it’s pretty hard and readily available. Going to stack it, bound it together apply a light coat of epoxy resin then sandwich it between two pieces of 0.125 aluminum.
The rear/outside of the transom is made out of 0.125 so between the core that has two pieces of 0.125, the rear 0.125 and the peace of 0.250 that I’m going to use as an overlay this new transom is going to be super rigged and will probably weigh less that the rotted wood core that came out.