Transom material

Not sure if this should go here or conversions, but...

My new to me boat had the transom replaced with starboard (HDPE) material. While the intentions were good (rot free transom), the end product leaves something to be desired. He did the interior side in 2 pieces, so there is a seam just to the left of center, which IMO, renders it almost useless. I like the idea of the HDPE, and was thinking of reinforcing it with a 1/8" - 3/16" stainless steel sheet. That way it would be thick (almost an inch), and it would be rot and rust resistant. In other words, a lifetime transom. My question is, any reason this won't work? I don't think there would be risk of galvanic corrosion, since SS bolts are used on regular wood transoms, and the SS plate wouldn't be in contact with anything aluminum that I can see.

Has anyone done this?

i used something similar and sandwiched it between two large 1/4 aluminum plates. I can see your concern with the transom being slip, seems like it would be a weak point for sure, but i am not an engineer.

Here are some pics of mine.

What material did you use between the plates? Aluminum plate(s) may be better, cost-wise, and weight-wise.

i'm told it is a type of HDPE 3/4 inch thick with UV inhibitors,and it just happened to match my boat color. we use it at work to make wear plates for some equipment, extremely tough stuff, i do not ever expect to have any issues with my transom now.