Standard's 18g, but it's very possible that yours are 20g. Kinda depends on where you get the posts. But yeah I hear you. I personally don't have an allergy to nickle, but I know a lot of people who do, so I was curious.
And yeah, that's smart. Having a master copy like that is going to let you replicate things more accurately. I'm going to second Kayla here too. I'd love to see a Great/Ultra/Master edition! n_n;
Super impressed by your work. I had a really great business relationship with someone on Etsy who made custom gauges (I'm at 5/8ths so most things are custom for me anyway xD), so I can definitely appreciate your time and effort. Now, just out of curiosity, what kind of paint to do you use? It's water soluble, right? Like, would I be able to shower/sleep with those in?
Sorry for asking so many questions, I've just always really liked functional 3D art like this but I've only ever worked with people, never done it myself.