I had left over 1/2” Coosa nautical 15 from a prior project so used that where thought was best for higher loaded areas and wasnt worried about a few lbs of added weight forward. Also put it under rod holders, cleats for better strength compared to the lower density core.
White stuff was 4lb foam that was kerf cut to make it conform to curves. Makes it easy to cut with shop knife to minimize waste.Pictures didn’t show next step after bonding to cap with Core-bond, trimmed to a line and beveled edges of foam so laminate would lay with no air bubbles.
Core here has little strength compared to laminate. It just creates thickness which increases stiffness for a given laminate top and bottom. My opinion is fitting pieces is fine for this as long as you have a good bond to laminate and minimize/eliminate air pockets.
Transom is a little different animal as the loads are large and need to take these and bolt loads from brackets and spread them out via laminate and a stronger stiffer core material. Used the Coosa Bluewater 26 on my transom. Think there are other similar products that would be fine that may be cheaper.
Youll have to estimate your areas as my purchase records dont account for scraps I already had...
Good luck
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