I took some measurements with the micrometer and I found that the pipes on the kit are usually one of three sizes:
0.5 mm Which corresponds to 25 gauge wire using the AWG spec.
1.0 mm Which is about 19 gauge
1.25mm which is close to 18 gauge, and
1.5mm which is 16 gauge
There are a few at 2mm as well which is about 14 gauge. I took my measurements on the hull, and not were the pipes leave the hull, they change size there.
To be honest, just use what you think is close to correct.
Solid core copper or aluminum wire would be much easier to work with than brass or music wire. The reason I am not doing so is that I don't want to take the trouble to straighten it out. I want to start with a perfectly straight piece and put the bends in where I want them. If one of you knows how to straighten out wire, please post it!
One other thing to think about, craft stores. Many people make their own jewelry, and you can get wire, both aluminum and copper there for pretty cheap. A bonus is that there is no insulation on this wire, and it is softer than brass. I got 30 yds of 26 gauge copper for around $4 us. Far cheaper than brass. Since I know the gauges now, I might revisit the craft store.....
I also got a vice today, I need to wrap the jaws in electrical tape before I use it.
Here is the photos of the blue moon upgrade kit:
I did make a video review, but it will be almost a week before I can post it.
Speaking of which, my build rate will slow a bit, I am going to start alternating between the MF and the A-wings. I have now spent about equal time on the two of them and I need to get working on those A-wings.....