Re: Embedded Chain plate maint/replacement
I've never seen a backing plate used on the outside in that situation.
Remember, the primary force on a chainplate is UP, which puts the fasteners in shear, so a backing plate is of limited usefulness. Building up the hull laminate in the localized area would be more effective.
I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.