Re: Chain plate or impact.
Glass work is what is referred to as "semi-skilled labour". Most boats other than high tech ones are laid up by low paid workers. It takes very little experience to get quite good at it. Experience mostly makes your work neater, not stronger.
Cutting out those chains would be nasty work due to all the cutting & grinding it would require but it wouldn't require a lot of skill. Having a second person holding a powerful vacuum next to the tool would help a LOT.
That's assuming they aren't also buried behind cabinetry - removing that without damaging it would require some finesse.
People who haven't done glass work are often intimidated by it but if you can wallpaper you can laminate glass. I find it easier than papering actually because you don't have to be so precise - the seams don't have to be perfectly aligned.
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.