It's not as complicated as it seems they already electroplate airsoft parts using chrome which is basically the same process, just isn't as hard as nikasil.
it involves dipping the negative charged part in a positive charged vat of nickel and silicon carbide, than the particles are attracted to the surface of the part you are plating.
the longer you leave it in the thicker the plating.
I would like to see a barrel plated in this stuff, imagine a perfectly smooth bore that never scratches and is almost completely frictionless.
maybe some day I'll send a barrel to an engine shop and see if they'll plate it. who knows maybe they will