Been down this route before on AJS restoration. As the bike will be kept in garage or shed at the best and not in the front room, it will be exposed to a certain amount of damp unless a humidifier is used. With chrome nuts / bolts, soon as you get a spanner on them the chrome surface can mark and lead to rust forming, leading to paint blistering on painwork in the future. You get the same result using bright zinc plated (now used instead of cadmium due to enviromental issues) nuts & bolts. I know it's more expensive, but I think stainless steel is the way to go, even if you do it gradually you only have to fit it once. I use D. Middleton for all stainless steel fixings....excellent quality / finish.
Howard.