Shapes of the plates would be unique, and opposite hand on the other side, I would assume due to the change in rake and curve as the ship constantly changes profile, some of the changes were at the discretion of the craftsman who rolled the complex curves to have it fit. correct me if I am wrong.
No discretion at all! both sides have to match, remember.
It's even more complicated than I remember. Everything in a shipyard is done with jigs, moulds, forms and patterns. Datums are used and measurments ran from them along with string lines and levels.
Making the moulds for the armour plates starts with a datum line down the centre of the armour joint (this book was written when 2 tiers of armour was the norm) It is marked C in the diagam. The upper plate was measured upwards from the datum and the lower downwards.
Basically, the 'Surface Mould' gives the armour maker the perimiter size and shape of each plate, the 'Plan Mould' shows the curviture of the plate surfaceas looked from above while the 'Section Mould' provides the vertical shape.
Note the Surface Moulds are in a 'brick wall' pattern.
I KNOW that armor-plate making was an art-form and that the red hot plate both shrunk in size with any curves flattening slightly on cooling, thus plates were made slightly over-size and with slightly exagerated curves to allow for it.
HTHs
p.s. I've just read that each complete side of armour was erected in the workshop to test for fit prior to sending the plates to the shipyard. The minds boggles at the energy expended.