Need a better resolution pic of the cap! Were those cracks on the outside of hull there before the transom was replaced or have they just shown up? Never seen cracks like that but they look to be right at front edge of transom core. If they showed up after transom was replaced, I'd say something is going on with that transom. Does the bracket/motor deflect if you jump up and down on lower unit?
How much and what type of glass was installed on inside of new transom, how far was it wrapped around into the hull sides, what sort of core was used, how thick was it, and what type of resin was used? Those cracks on the inside between look quite large, almost like there is significant flexing there, much wider than what occurs due overly thick brittle gel coat. Is that a vertical brace on the transom that also looks like it's cracked at the transom/brace joint?
The original CC models had a large inner liner that appeared to be integral with the top cap that was bonded to the top of the stringers. The box shaped structure created by the inner liner and outer hull adds a lot of torsional stiffness to the hull. If the vertical section of the inner liner was removed when deck was replaced, it might explain what you're seeing. To illustrate my point, take a shoebox and try to twist it with no lid on it. Then tape the lid on and try again and notice the difference, which will be significant.
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