That s a great mod Andy! Much respect for that! Cutting off the ends of the hooks and making it work, that is what it is all about! Pelicans are designed for ropes for lifelines so they are always round. In your picture they look copper, maybe just the way the light it hitting them.
I love sailing and equipment and use pieces from boats all the time. I never thought about using them for latches (really kicking myself right now), I always use the big brass clips, but now you have me thinking. Thanks for the share, and keep up the great work!
As far as tooling stamps and using a swivel knife go, you are in the right place to get tips and advise for that!!!!!
Take some of the scraps the you have left over and give it w whirl...practice, practice, practice...If you are not sure what you need there is a place on the forum here about tools for beginners, and there are a lot of videos on Tandy's Web site, that should get you up and running before you know it. Stamps are all about consistency, the amount of force made to make the stamp last and repetition along with rhythm for things like backgrounders. Swivel knife work, best rule is to cut 1/2 the depth into the leather and bevel the knife cuts to make it from 2d to the glorious 3d that you are searching for.
It seems you are not a novas when it comes to tools , so just like everything else work and tool related let your tools do the work they where designed to do, a hammer has different weights for a reason, let the hammers do their job no need to over work your arm:) I have 3 different weights depending on what I am using the stamps for.
Looking forward to your next project:)