Geoff,
I made my own Zinc kit for maybe $50 with great results. I have plated everything from nuts and bolts, spokes to rear brake rods (using a wallpaper tray). The mix is important, I think a 100 grams of sea salt to 1 litre of vineger. And yes it takes a while but being the closest plater is an hour and a half away and I can do bits as I need them. I can find the link that I used for reference in the morning (2 am here) and some photos if you like. I also do it because I like to say I can.