How badly is it curved and is it concave (inward) or convex (outward)?. If minor and out, I would think it would be less of a concern and an easier fix. I'm looking at doing a boat which has the horseshoe your talking about. I got measurements from Don on the bracket already and figured out from his instructions where it will mount. I'm lucky in that the "horseshoe" is the raised portion and there is no curve in my transom in that area. Basically, the outer 6" ends of the swim step will be floating by about 3/16". I figure I will just match that area with either glassed in strips or cabosil/epoxy on the transom itself since there will not be as much stress at the bracket ends.
My point being, it depends on your situation and where the curves are. An outward curve would be better since a majority of the strength of the bracket to transom connection needs to be in the middle area where the tub is. That being said, it sounds like Don's design does strengthen the entire transom across the swim step.
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