When you order from Jim, do as much of it at once as you can afford. Start with the action vice, it costs the most to ship. It's not Jim's ripping you off, he's a great guy by the way ... the vice weighs a ton. You'll be sorry (like I was) if you buy it by itself.

The recoil lug and nut aren't essential, but they are quality pieces and do lend a bit of confidence to a build. Look around here and you'll see a picture or two of a blued action and barrel with stainless lug and nut. It's quite an elegant look, kind of like a two-toned 1911, IMHO. You'll be fine either way, and the very best thing about building your own, is you can make it exactly how you like it.