Macgregor has been using the nicopress for a while... he sells a few boats every year. I'm not suggesting nicopress for every application, but it has it's place. Which isn't to say that Brian Toss isn't the rigging god. His book is well worn and still sits with easy reach.
Neoxaero.. were you able to retrieve an entire chainplate, even if it's in two pieces? Most shops will prefer to work from a part, rather than knock something out with just measurements. Of course, either way, you shouldn't have much trouble.. it's a pretty straightforward piece.
Gratz on doing so much work yourself!
... or I'm wrong.
Living aboard, currently in the Chesapeake
O'Day 37, still new to us