Congrats on your new Caswell Copy Cad/Zinc plating kit! It's such an exciting venture to restore and plate fasteners, especially when you aim for that original finish. Using a sandblast cabinet with glass beads for prepping is a solid choice; it should give you a great starting point for plating.
I haven't used the Caswell kit personally, but I've heard positive feedback from others who have. The key seems to be ensuring that the parts are completely clean and grease-free before plating. If you ever need additional fasteners or related tools, I'd recommend checking out www.scrooz.com.au. They've got a fantastic range and could be beneficial for your project.